14 best 12v battery maintainers

A 12V battery maintainer, also known as a battery tender or trickle charger, is a device designed to keep a 12-volt battery charged and in good condition over an extended period of inactivity. These maintainers are commonly used for various applications, including automotive, marine, RV, motorcycle, and more. Here are some key points about 12V battery maintainers:

  1. Purpose: The primary purpose of a 12V battery maintainer is to prevent the gradual discharge and sulfation of a battery that occurs when it is left unused for an extended period. Sulfation is a process where lead sulfate crystals form on the battery plates, reducing its capacity and lifespan.

  2. Low Charging Rate: Unlike traditional battery chargers, maintainers provide a low and steady charge to the battery. They typically deliver a current in the range of 1 to 2 amps, which is enough to compensate for the natural self-discharge of the battery without overcharging it.

  3. Voltage Regulation: Battery maintainers are designed to monitor the battery voltage and adjust the charging rate accordingly. When the battery voltage drops below a certain threshold, the maintainer provides a small charge to bring it back up to an optimal level.

  4. Automatic Operation: Most 12V battery maintainers are fully automatic, meaning they can be connected to the battery for an extended period without the need for constant monitoring. They are also designed to stop charging when the battery is fully charged, preventing overcharging.

  5. Compatibility: Battery maintainers are compatible with a wide range of 12-volt lead-acid batteries, including flooded, AGM (Absorbent Glass Mat), and gel cell batteries commonly used in vehicles and recreational equipment.

  6. Long-Term Storage: Battery maintainers are particularly useful for vehicles or equipment that are stored for long periods, such as classic cars, boats, RVs, motorcycles, and lawnmowers. They help ensure that the battery is ready to use when needed.

  7. Maintenance Mode: Some advanced battery maintainers offer a maintenance or float mode, which provides an extremely low charge to keep the battery topped off without risking overcharge.This mode is ideal for batteries in storage.

  8. LED Indicators: Many battery maintainers come with LED indicators or status lights to show the charging progress and battery condition, making it easy for users to monitor the charging process.

  9. Safety: Battery maintainers are designed with safety features such as reverse polarity protection to prevent damage if the connections are reversed and short-circuit protection.

In summary, 12V battery maintainers are essential tools for maintaining the health and longevity of 12-volt lead-acid batteries. They offer a simple and effective way to ensure that batteries remain charged and in good condition during periods of inactivity, making them a valuable asset for anyone with vehicles or equipment that require periodic maintenance or long-term storage.

Below you can find our editor's choice of the best 12v battery maintainers on the market
  

BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals

BLACK+DECKER

Based on 8 reviews Check latest price

Product description

This Black and Decker Battery Maintainer and Trickle Charger will work with both 6-volt and 12-volt batteries. It is ideal for battery maintenance, charging RVs, specialty vehicles, antique and classic cars, motorcycles, lawn mowers, tractors, ATVs, snowmobiles, personal watercraft and more. There are two LED indicators—a red one for fault and a green one to show charge status.

  • Charges and maintains 12 volt and 6 volt AGM, GEL and WET batteries
  • Easy connection to vehicle battery using battery clips and O-ring terminals
  • Stops charging automatically when battery is fully charged or topped off, switching to float mode monitoring
  • Built-in circuit protection guards against overcharging, reverse polarity, or short circuit; ETL certified for performance and safety
  • Mounting bracket built-in to charger for convenient placement
  • AC Low voltage compensation ensures maximum performance when used with an extension cord

User questions & answers

Question: How long are the cords
Answer: There are only two ways to Efficiently & properly charge the unit, plug it into a house 110 V outlet or Or I use a 4000 W inverter in my truck and I plug the inverter primary into the cigarette lighter and the secondary is 110 V which works great on that Max in addition to charging at the same time many charging tool batteries and led work lights. I leave it plugged in My trucks Invertor all the time while driving and all my tools including the max are always charged and hot ready to go.
Question: Just want to make sure I understand this correctly - you can plug this into the cigarette lighter and don't need to connect to the battery
Answer: I wouldn't count on this type of pack for anything with a motor (power tools, the blender, pumps, etc). I tried running a small fridge off a 400 watt inverter connected to a car battery and that wouldn't work. The fridge only needed ~120 watts running, but to start it's motor the "Surge draw" was ~1000 watts that would put the inverter in "overload" alarm every time. So despite the minimal time of running the blender, that "surge draw" is quite often too much for these small inverters.Also FYI, the batteries in these can give you ~200 watts of power for 1 hour (or 100 watts for 2 hours, etc). That's how long they'll last alone. I've seen in manuals that "You can extend the run time by connecting up another battery via the jumper cables", yet if you need multiple parts anyway I'd be tempted to look at a separate battery big enough for everything and a bigger inverter.One of the best suggestions I can make is get something like the "kill-a-watt" meter and see what power your blender & things need for how long. That meter costs $20, so before spending $100+ on this I think knowing what you really need (measuring the power demands) is worth it. That meter can show you both power draw while running (for inverter sizing) and KWH power use (for battery sizing).
Question: how fast does it charge
Answer: I don't have a CPAP or such, but have seen this question posted many times (look under the similar units like Schumacher XP2260 or Duracell 600 packs). This like those other packs has about an "18 amp-hour" battery hinting it can provide 1 amp (at 12V) for 18 hours, or 2 amps for 9 hours, or 3 amps for 6 hours, etc. Many others have said they can get at least 1 night out of the packs if you don't need to run things like a humidifier function or such that needs much more power. Since I don't have the same equipment you do to really know the power use (as well as what settings you need), one of the best ways to find out how long this would last is to get a meter like the "Kill-a-watt" and measure the power use yourself. That meter goes for under $20, so before spending $100+ on this I'd see that as worth it. Based on the info I gave above these packs can provide about 200 watts for 1 hour (or 0.2 KWH). With some of the labels like "400 watt inverter" or such you may think it lasts much longer (like at least 1 hour under that 400 watt load), but it doesn't, so don't expect too much out of it (and that's the same for all packs like this).
Question: What is the float voltage? When the charger indicates it is done charging what is the voltage of the battery
Answer: Yes, you can charge this with many "12V" solar panels that are out there. Just beware that if a solar panels is directly connected up, they can raise the battery voltage to levels over 15V which is considered "Overcharging". So it's best to have a voltage regulator or "Charge controller" between the panel and battery (which will stop charging once the battery is at 14.5V which is "full" for it).

NOCO GENIUS2D, 2-Amp Direct-Mount Onboard Charger, 12V Battery Charger, Battery Maintainer, Trickle Charger, And Battery Desulfator With Temperature Compensation

NOCO

Based on 1 reviews Check latest price

Product description

The GENIUS2D is a 2-amp direct-mount onboard battery charger and battery maintainer for 12-volt lead-acid batteries, including flooded, gel, and AGM, as well as automotive, marine, and deep-cycle batteries. An ultra-compact battery charger with a 24-inch AC cable and a 24-inch DC cable with 3/8-inch eyelet terminals designed to be securely mounted near your battery. It's designed for all types of 12-volt lead-acid batteries, including flooded, gel, AGM and other maintenance-free batteries. It features an all-new integrated thermal sensor that improves battery charging in both cold and hot environments, automatic battery sulfation detection and repair, and a low start detection voltage of 1-volt. Comes complete with a snap-fit mounting bracket with truss head screws and a 3-year. 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  • Meet the GENIUS2D - The all-new direct-mount onboard battery charger for an under-the-hood battery charging system and year-round battery maintenance.
  • Direct-Mount - Securely mounts nearby the battery with its rugged snap-fit mounting bracket and effortlessly installs into most materials with truss-head self-tapping screws.
  • Enjoy precision charging - An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climates.
  • Charge dead batteries - Charge batteries as low as 1-volt, including flooded, gel, and AGM, as well as automotive, marine, and deep-cycle batteries.
  • Beyond maintenance - It's not a trickle charger, it's an advanced battery maintainer. It monitors your battery 24/7, providing intuitive and safe maintenance charging with zero overcharge. A fully-automatic, worry-free battery charger for year-round use.
  • Restore your battery - Automatically detects battery sulfation and acid stratification to restore lost battery performance for stronger engine starts and extended battery life.
  • Compatible with all types of vehicles - Add a permanent onboard battery charger to any vehicle to make battery maintenance simple and easy. Plus, combine with any of the GCP Series AC Port Plugs for remote charging access.

User questions & answers

Question: If i use this on a car, will the alternator charge it or does it only get charged through the plug
Answer: The GENIUS2D does not accept a charge. It is a power source. The GENIUS2D should be plugged into AC via the AC plug to recharge the battery.
Question: Is this water proof
Answer: The GENIUS2D is water resistant with a rating of IP65.
Question: will this work for motorcycle batteries
Answer: Yes; it works for my motorcycle, and the device is tiny enough to hide in a saddlebag.
Question: does everything you need come with this item
Answer: Yes.

Product features

SECURE BRACKET.

Use a drill to secure the mounting bracket using self-tapping screws (included).

ATTACH STRAP.

Loop the velcro mounting strap into the mounting bracket.

MOUNT GENIUS2D.

Clip the Genius 2D charger into the mounting bracket.

FASTEN STRAP.

Fasten the Genius 2D charger using the velcro mounting strap.

NOCO GENIUS1, 1-Amp Fully-Automatic Smart Charger, 6V And 12V Battery Charger, Battery Maintainer, Trickle Charger, And Battery Desulfator With Temperature Compensation

NOCO

Based on 11 reviews Check latest price

Product description

Introducing the all-new GENIUS1, making it one of our most powerful, highest-performing, energy-efficient, and compact charger yet. The GENIUS1 is a 6-volt and 12-volt battery charger, battery maintainer, trickle charger, and battery desulfator, rated at 1-amp for all types of lead-acid and lithium-ion batteries, including flooded, gel, and AGM, as well as, marine and deep-cycle batteries.



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  • Meet the GENIUS1 - Similar to our G750, just better. It's 35% smaller and delivers 35% more power. It's the all-in-one solution - battery charger, battery maintainer, trickle charger, plus battery desulfator.
  • Do more with Genius - Designed for 6-volt and 12-volt lead-acid automotive, marine, and deep-cycle batteries, including flooded, gel, AGM, and maintenance-free, plus lithium-ion batteries.
  • Enjoy precision charging - An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climates.
  • Charge dead batteries - Charges batteries as low as 1-volt. Or use the all-new force mode that allows you to take control and manually begin charging dead batteries down to zero volts.
  • Restore your battery - Automatically detects battery sulfation and acid stratification to restore lost battery performance for stronger engine starts and extended battery life.
  • Beyond maintenance - It's not just a trickle charger, it's an advanced battery maintainer. A fully-automatic, worry-free battery charger for everyday use - 24/7 - with zero overcharge.
  • Compatible with all types of vehicles - charge and maintain cars, motorcycles, lawn mowers, ATVs, lawn tractors, trucks, SUVs, boats, PWCs, classic cars, and more.

CTEK - 40-206 MXS 5.0 Fully Automatic 4.3 amp Battery Charger and Maintainer 12V (40-206)

CTEK

Based on 1 reviews Check latest price

Product description

The MXS 5.0 offers a unique eight step approach to battery care. Fully automatic microprocessor controlled charger with built-in automatic temperature sensor features a unique combination of advanced charging modes and makes the new MXS 5.0 the fastest, most effective and versatile consumer charger CTEK has ever made. The MXS 5.0 features capabilities for improved charging in all weather. It is the perfect charger for the user with multiple vehicle types and higher demand battery charging and maintenance requirements. Provides an outstanding charging experience!

  • Unique reconditioning mode, built-in temperature sensing capabilities
  • Completely sealed Unit, spark proof and reverse - polarity protected
  • Premium input and output cable with robust strain relief
  • 5 year warranty. Ideal for start-stop systems
  • Input voltage 110-120 VAC
  • Minimum battery voltage required: 2V

User questions & answers

Question: What is the ac input voltage & frequency
Answer: Depends where you purchase it. If purchased in USA comes with a 2 pin plug/cord and set for 120v but elsewhere set for local market voltage and plug e.g. in UK has 3 pin plug and set for 240v.
Question: Why does amazon say this won’t work with a 2007 Porsche Cayman
Answer: Our MXS 5.0 (40-206) is a 12V, 4.3 amp charger recommended for lead-acid and AGM batteries up to 160Ah. If your battery meets this criteria it will work fine on your vehicle.
Question: Will this work for a 2017 Porsche Macan S
Answer: Will this work with a 2018 Porsche macan
Question: What’s the difference between this mxs 5.0 charger and a mus
Answer: Don't agree with D. Raupp: the number is not the amps it can put out but likely a number larger that 4.3 to show that it's a newer version in their line up. This charger is the next generation of the 4.3 with updated features/improvements, also with an added feature - the temperature sensing/adjustment. Called CTEK today and they said that 5.0 replaces the 4.3 which they are phasing out. This unit charges with several different amps: 0.8A; 4.3A; 2.5A; and 1.5A and switches automatically between them depending on which phase of the charge cycle it is in.

Product features

ADVANCED CHARGING WITH TEMPERATURE COMPENSATION

Automatic charging and maintenance for vehicle and motorcycle batteries, with reconditioning mode. The MXS 5.0 is an advanced microprocessor controlled battery charger which gives unrivaled performance for lead-acid batteries from 1.2-110Ah. It comes with automatic temperature compensation built in which ensures the best charging performance, even in the most extreme conditions. The MXS 5.0 also includes battery diagnosis to establish whether your battery can receive and retain a charge, patented automatic desulphation program, an AGM option that maximizes the performance life of most Stop/Start batteries and a special Recond mode for reconditioning deeply discharged batteries. The MXS 5.0 uses CTEK’s patented float/pulse system, which is the most efficient maintenance mode when a battery is connected for long periods.

Connect and Forget It

The CTEK MXS 5.0 offers a unique eight-step approach to battery care. Fully automatic microprocessor controlled charger with built-in automatic temperature sensor features a unique combination of advanced charging modes and makes the new MXS 5.0 the fastest, most effective, and versatile consumer charger CTEK has ever made. Alligator clamps and eyelets included.

Taking Safety and Ease-of-Use to the Next Level

The MXS 5.0 offers features such as a special reconditioning function that restores stratified and deeply discharged batteries, unique maintenance charging, and the charging of demanding AGM batteries (i.e. Optima). The charger is splash and dustproof, designed to protect vehicle electronics and non-sparking, reverse polarity protected, and short-circuit proof.

Battery Tender Junior 12V Charger and Maintainer: Automatic 12V Powersports Battery Charger and Maintainer for Motorcycle, ATVs, and More - Smart 12 Volt, 750mA Battery Float Chargers - 021-0123

Based on 28 reviews Check latest price
  • STAY CHARGED: Provides a full charge to your machine’s battery before switching to float mode to maintain proper voltage levels for safe, long term storage without overcharging. Spark proof during lead connection, reverse polarity protected and includes a 12-foot output cord and 5-year warranty
  • EASY TO USE: Low maintenance design to be quick and easy to use, our universal powersport vehicle charger and maintainer is compact and lightweight. Perfect for charging all 12-volt lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell) and safety timer-80 hours
  • EXTENDED BATTERY LIFE: Compatible with lead-acid, flooded, and sealed maintenance free batteries (AGM and gel cell) to be ideal for use in long term storage. Complete 4-step charging program (Initialization, Bulk Charge, Float Mode) allows for optimization of battery power, without overcharging
  • MONITOR POWER LEVELS: Solid state two-color LED light indicates the state of the charge and if the battery voltage drops too far under load, ISM adaptive charging will resume full charger output power. Automatic charge cycle functionality switches to float mode after fully charging the battery
  • SAFE AND SECURE: Our 12v battery charger and maintainer is spark-proof during lead connection and automatically detects reverse polarity to ensure a correct. Solid state two color LED indicates stage of charger and if the battery voltage drops too far under load, full charger output power resumes

User questions & answers

Question: Why is it not recommended to keep a trickle charger hooked up all the time
Answer: beats me. i keep mine hooked up from 12/31 to 4/1 and only then do i take it off. my understanding is that you do not need to disconnect it-it powers down on its own, but you mught want to find the user nistructions and check me on that. good product if youre not in a hurry
Question: how fast does it work
Answer: if your battery is low it may take up to 3 0r 4 days since it's a low amp charge and designed to keep the battery at full charge once it's at full charge. This charger is super for use when you don't drive the vehicle a lot and it sits for any length. it can be used on the battery in the car or taken out, once it's on it can stay plugged in all winter of summer just unplug it when you go driving. If the car stays outside they make a waterproof model. If your looking for a fast charger this is not what you want, if you do buy this make sure it's the 12 volt model ... hope this will help you
Question: Why is this not available in California
Answer: Charge for free! Buy a low wattage solar battery charger/maintainer at Harbor Freight instead because it works very well maintaining the battery charge provided that the battery is fully charged before hooking up this solar charger.... it will only maintain the charge. Not made to fully charge a discharged battery. Point the solar panel southwest to get the most out of the sunlight during daytime. I have used this $9.99 if on sale gadget for years now on my boat and car and has not failed me yet. It comes with all the hook up accessories needed. I have not used the boat for 2.5 years at a time and the gel battery is as good as when I installed it 7 years ago. My car wet cell battery also is as good as when I first installed it and I only use the car abroad every 12 months when I am in town for 3 weeks. Car or Boat batteries Gel or not will not last it's lifetime if it is always discharged and recharged. Maintaining the charge is key to it's longevity. Good luck! No need to blame anybody. The State of California is an environmentally conscious state and that is a good thing for everybody.
Question: Can this be used to charge an AGM battery
Answer: Stupid me, but don't all lead acid batteries use the same chemistry? I've read only that 6-cell lead-acid batteries should never use a charging voltage exceeding 14.4 volts, since water will begin to H2 gas and O2 gas above that. You risk explosion and loss of electrolyte beyond that. Explain why this is different for AGM, Flooded, and Gel batteries!

[4-Pack] LEICESTERCN Automatic Trickle Battery Charger Maintainer 12V 750mA Smart Float Charger for Car Motorcycle Lawn Mower Tractor Boat SlA ATV WET AGM GEL Cell Lead Acid Batteries

Based on 87 reviews Check latest price
  • √ CHARGE AND MAINTAIN - Charge for all types of 12V lead-acid batteries, including flooded or sealed maintenance free batteries (AGM & gel cell). A smart car battery charger for automotive, motorcycle, marine, RV, Powersport, lawn&garden, children toys, etc.
  • √ 3-STAGE SMART CHARGING - Fully auto CC-CV(H)-CV(F)charging process, the battery maintenance charger monitor the whole charging process, automatically switches to float mode after fully charging the battery.
  • √ INTUITIVE LED INDICATORS - With Bi-color LED indicator, CHARGING/FULL light yellow:charging, Green: fully charged/floating; REVERSE POLARITY light red: reverse polarity, provide visual state-of-charge feedback and diagnostic information, even when in maintenance mode.
  • √ SAFETY PROTECTION & BATTERY RESUE - Just plug and leave it for charging and maintaining your batteries automatically, no worry about overcharge, over voltage and reverse polarity, the battery maintainer charger will extend battery life and recover batteries effectively. Key Product Features
  • √ ETL SAFETY CERTIFIED &100% SATISFACTORY FLOAT CHARGER - Certified by ETL, CE, FCC, RoHS, 3-Year quality assurance, hassle-free return or refund for any product issue, 24/7 timely customer service, eliminate all your worries about getting this car battery charger.

User questions & answers

Question: What is the length of the cables (wires
Answer: THE AC PLUG WIRE I ABOUT 6 FEET. THE BATTERY CONNECT WIRES ARE ABOUT 3 FEET.
Question: Does it only have the alligator clips
Answer: Packaged with alligator clips for an alternate connection and o-ring terminal harness for hard to reach spaces
Question: Would this unit charge a 12v 120Ah battery
Answer: The MFG. recommends 4-18AH for this charger. If the charger doesn't sense something that turns it off, it might take 3-4 days to charge a 120AH completely. I put it on a car battery that took a day to bring up to float voltage, so it might be fine, but slow with a 120AH battery.
Question: Can I charge the lithium battery
Answer: Absolutely not, just for 12 volt lead acid batteries

NOCO GENIUS5, 5-Amp Fully-Automatic Smart Charger, 6V And 12V Battery Charger, Battery Maintainer, Trickle Charger, And Battery Desulfator With Temperature Compensation

NOCO

Based on 4 reviews Check latest price

Product description

Introducing the all-new GENIUS5, making it one of our most powerful, highest-performing, energy-efficient, and compact charger yet. The GENIUS5 is a 6-volt and 12-volt battery charger, battery maintainer, trickle charger, and battery desulfator, rated at 5-amp for all types of lead-acid and lithium-ion batteries, including flooded, gel, and AGM, as well as, marine and deep-cycle batteries. 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  • Meet the GENIUS5 - Similar to our G3500, just better. It's 34% smaller and delivers 65% more power. It's the all-in-one solution - battery charger, battery maintainer, trickle charger, plus battery desulfator.
  • Do more with Genius - Designed for 6-volt and 12-volt lead-acid automotive, marine, and deep-cycle batteries, including flooded, gel, AGM, and maintenance-free, plus lithium-ion batteries.
  • Enjoy precision charging - An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climates.
  • Charge dead batteries - Charges batteries as low as 1-volt. Or use the all-new force mode that allows you to take control and manually begin charging dead batteries down to zero volts.
  • Restore your battery - Automatically detects battery sulfation and acid stratification to restore lost battery performance for stronger engine starts and extended battery life.
  • Beyond maintenance - It's not just a trickle charger, it's an advanced battery maintainer. A fully-automatic, worry-free battery charger for everyday use - 24/7 - with zero overcharge.
  • Compatible with all types of vehicles - charge and maintain cars, motorcycles, lawn mowers, ATVs, lawn tractors, trucks, SUVs, boats, PWCs, classic cars, and more.

MOTOPOWER MP00205A 12V 800mA Automatic Battery Charger, Battery Maintainer, Trickle Charger, and Battery Desulfator with Timer Protection

MOTOPOWER

Based on 4 reviews Check latest price
  • 🔥[ Charger, Maintainer & Desulfator ] - An all-weather battery charger, battery maintainer, trickle charger, and battery desulfator. Perfect for charging and maintaining all 12-volt lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell). ETL safety standard Listed.
  • 🔥[ Automatic Desulfation & Optimization ] - Automatic detection of battery sulfation problem. Applying with pulse current technology to desulfate the batteries effectively. Optimize the battery performance during charging without any manual operation.
  • 🔥[ Energy Saving & Spark Free ] - Zero output in standby mode. No battery drain when connecting with the battery. Spark proof during lead connection for safety.
  • 🔥[ Multi-level Safety Protection & Timer Set Up ] - Overcharge, short circuit and reverse polarity protected. Charge the battery up to 14.4V and Maintain the battery at 13.6V for long time to avoid gasing and to extend the battery life. 24-hour Timer is set up in the program to terminate the charge and enter the maintaining mode once the voltage is above 14V to ensure safety.
  • 🔥[ Easy for operation ] -Just plug-in, connect to the battery and start charging or maintaining your battery. The desulfation is working automatically during the charing. No manual operation.

Product features

Low-Voltage Activation & Recovery

Pulse current applied for batteries between 4 - 8volts. Increase the battery voltage gradually to optimize the cells and restore their best performance.

Absorption Mode

Force pulse current in the absorption stage to desulfate the cells. Removing the troublesome crystals and absorb into the charge cycle.

Maintain at 13.6volts Indefinitely

Maintain the battery with float current close to 0.1 - 0.5amp and keep the battery at 13.6V+/-0.2V indefinitely. Restart charging when voltage drops.

Charging Stages

Five CHARGING STAGES - Diagnosis, Soft Start, Bulk Charge, Absorption and Float/Maintenance. Bring the batteries to back to life.

Energy-Save & Safety

No output without load. No battery drain when connecting with battery. Spark free for safety.

Recondition Batteries

Sulfation detection and repair cells damage. Optimize the battery chemistries.

Thermal Compensation

Stable performance for any climate. Low temperature activation.

Timer Protection

24-hour absorption/desulfation. Stop automatically when fully charged or when time's up.

Direct Factory Source from MOTOPOWER Factory - Quality Ensured & Cost Effective

Product Features:

The MOTOPOWER MP00205A 12V 800mA Battery Charger allows you to connect the charger to the battery and leave it for maintenance indefinitely.

Once the battery has reached a 100% charge, the chargers will automatically switch it's output voltage to a safe, storage/float level (13.6V+/-0.2V) that eliminates the need to worry about the damaging effects of overcharging.

Pulse Current Recovery Mode:

In the Absorption Mode, the charger will give a 0.5Amp pulse current to charge and recover the battery until it's fully charged. In this stage, the charger will decrease the battery sulfation and improve the battery performance gradually. For several times charging, you will find the battery internal resistance is lower and the performance is improved.

Technical Details:

- Input Voltage: 100-240V AC / 60Hz. - Output Voltage: 12 Volts DC @ 800mA - Charged Voltage: 14.2+/-0.2 Volts

- Maintenance Voltage: 13.6+/-0.2 Volts - Activate Voltage: 4Volts ( Do not suggest charging dead batteries )

Package Includes:

- Battery Charger x 1 - SAE Alligator Clamp Cable x 1 - SAE Eyelet Terminal Cable(7.5A fused) x 1 - Instruction Manual x 1

Foval Automatic Trickle Battery Charger 12V 1000mA Smart Battery Charger

Based on 5 reviews Check latest price
  • (Safety with ETL Listed): Spark proof during lead connection, reverse polarity protected and includes a 8 foot output cord and 2 year warranty
  • Perfect for all lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell), also Complete 4-step charging program (Initialization, Bulk Charge, Absorption Mode, Float Mode)
  • Small size 3.9 x 2.4 x 1.25 in and suitable for Most Vehicles: adapts to all kinds of 12V battery for automobiles, motorcycles, ATVs, personal watercraft, RVs, boats, airplanes, golf carts, back-up generator systems lawn mower, etc, batteries using either the ring or alligator connectors, automatically switches to float, maintenance voltage after fully charging the battery
  • Intuitive LED indicators provide visual state-of-charge feedback and diagnostic information, even when in maintenance mode.
  • It will charge and maintain your battery so that it is ready to go when you are! It's lightweight, fully automatic and easy to use

User questions & answers

Question: is it support 220v
Answer: My box says: Input 100~240V~1A, 47~63Hz Device says: Input 100-120V~50/60Hz 1A Instructions say: Input AC 100-240V Don’t know what to believe...
Question: Do I need to disconnect my car battery, or can I just add the clamps to the installed battery
Answer: I have it on my generator battery but I am told that you can leave them on a car battery also. I took battery connections apart and put the two rings on the battery. Then its ready to charge at any time.
Question: I have a 92 f350 diesel that has two batteries. Can I hook this up to one side and it will keep both battries charged
Answer: Use a digital multimeter to check continuity between + and + on both batteries, as well as - and -. If batteries have a common + and - node with each other, they are in parallel and this charger will charge both simultaneously. If there is no continuity, there is an internal relay isolating the batteries from each other and you'll have to charge individually.
Question: Can this be used to Jump Start my car
Answer: No way will this help to Jump start a car. If you allow it to charge the battery then let the battery start the car it will have done its' job. When a starter on a car engages the cranking mechanism of the car it draws hundreds (greater than 300 and probably closer to 400) AMPS. The charger cannot supply anywhere near that kind of current. The charger can supply 1000 ma (that's milliamps which = so, .001 amp. X1000 = 1 Amp. To try and start a car with this charger may likely damage it. Hope this helps.

BMK 12V 5A Smart Battery Charger Portable Battery Maintainer with Detachable Alligator Rings Clips Fast Charging Trickle Charger for Car Boat Lawn Mower Marine Sealed Lead Acid Battery

Based on 2 reviews Check latest price
  • 【UPGRADED DEFECTIVE BATTERY DETECT/FAST CHARGING CAR BATTERY BOOSTER】Updated with battery condition diagnose to detect the defective battery before charge. Input 100-240V AC, With 5A DC output current, BMK 12V 5A car battery charger is suitable for charging batteries with 15-100Ah. NOTE: To better tender the battery, please make sure the battery capacity is higher than 15Ah, it can also charge over 100Ah batteries, just more charging time. ETL Certified for performance and safety
  • 【UPGRADED 72-HOUR SAFETY FEATURES/MULTI SAFETY PROTECTIONS - BATTERY RESCUE & RECOVER】Updated with 72 hours safety feature to commence anytime the charger is onto protect marginal batteries from over charging. Made of high quality ABS, multi-protects of Short Circuit/ OV/ OC/ Overload/ Polarity Reverse, featured with Constant Pulse Current Maintenance function to avoid overcharge and discharge; Full-loaded and burn-in test prove its high reliable efficiency, stable performance
  • 【4-STAGE SMART CHARGING - FULLY AUTOMATIC BOAT BATTERY CHARGER】 12V battery charger operated with 4 stages automatic charging process by MCU controller, 25%/50%/75%/100% to indicate quantity of electricity and monitor the whole charging progress. Stop automatically when the battery is fully charged. LED indicator designed to display different charging status of the 12v smart charger
  • 【UPGRADED WITH 10A FUSE ONTO RING CONNECTORS & MULTI-PURPOSES DEEP CYCLE BATTERY CHARGER】Pb/SLA/VRLA/GEL/AGM lead acid battery charger tender, operated with vulcanization function, BMK battery maintainer charger is a great choice for lawn mower, boat, car, motorcycle, electric vehicle, electric tools and emergency battery charging, lightweight(15.87oz) allows you take it to anywhere, used as Trickle Battery Charger as well
  • 【QUALIRY ENSURANCE & IN TIME SERVICE】BMK is devoted to provide boat battery trickle charger with higher qulality to meet buyers' needs better and timely after-sale services, eliminate all your worries about getting this trolling motor battery charger. Just get your Automotive Car Battery Charger Maintainer with confidence, and contact us if you have any problems about the item when using

Product features

BMK 5A SMART BATTERY CHARGER IN HAND, ALL BATTERY TROUBLES GO AWAY.
STAGE 1 - DIAGNOSTIC

Desulfating the Battery Through 18V Pulse

The Charger can be used with 12-100Ah, however 12-60Ah is highly recommended for higher efficiency and battery protection.

STAGE 2 - BULK CHARGE

Charging Highest Rate Current Till 80% Capacity

Featured with LED for indicating different charging modes

Alter the charging process based on organic battery feedback.

STAGE 3 - ABSORPTION

Absorption, Till Full Capacity

Output voltage is limited to 14.7V while current declines as the battery to be fully charged.

Stabilize internal battery chemistry to increased performance and longevity.

STAGE 4 - MAINTAIN

Float, Maintain the Battery Through Pulse Charging

Battery is fully charged at this stage.

Minimize energy consumption when full power is not needed.

DEFECTIVE BATTERIES DETECT

  • The Fault Light Flashing: Reversed Polarity
  • The Fault Light ON: Defective Battery

SPARKPROOF

  • Prevent sparks
  • Automatically check whether the connection is correct or not before powering up

QUICK DISCONNECT HARNESS

  • Connect and disconnect with the battery in seconds

72-HOUR SAFETY FEATURE

  • Upgraded 72 Hour Safety Timer to commence anytime the charger is onto protect marginal batteries from over charging

NOCO GENIUS2X2, 2-Bank, 4-Amp (2-Amp Per Bank) Fully-Automatic Smart Charger, 6V And 12V Battery Charger, Battery Maintainer, Trickle Charger, And Battery Desulfator with Temperature Compensation

Based on 446 reviews Check latest price

Product description

Introducing the all-new GENIUS2X2, making it one of our most powerful, highest-performing, energy-efficient, and compact charger yet. The GENIUS2X2 is a 6-volt and 12-volt two-bank battery charger, battery maintainer, trickle charger, and battery desulfator. It is rated at 4-amps (2-amps per bank) all types of lead-acid and lithium-ion batteries, including flooded, gel, and AGM, as well as marine and deep-cycle batteries.Other commonly used search terms: battery charger, car battery charger, battery charger automotive, battery maintainer, 12v battery charger, 12 volt battery charger, 6v battery charger, 6 volt battery charger, auto battery charger, agm battery charger, deep cycle battery charger, bike battery charger, motorcycle battery charger, car battery maintainer, automotive battery charger, motorcycle charger for battery, battery charger for cars, automatic battery charger, trickel battery charger automotive, trickle charger, trickle charger for car, trickle charger for car battery, trickle charger for 12 volt batteries, trickle charger for motorcycle battery, trickle charger 12v, trickle charger 6v, trickle charger for motorcycle, trickle charger for automobiles, trickle charger for lawn mower, battery maintainer 12 volt, battery 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  • Meet the all-new GENIUS2X2 - a two-bank battery charger, battery maintainer, trickle charger, and battery desulfator - the perfect all-in-one solution for battery maintenance.
  • Multiple banks - A two-bank battery charger maintainer rated a 4-amps - 2-amps per bank - designed to charge and maintain multiple vehicles like cars, motorcycles, boats, ATVs, RVs, lawn mowers, lawn tractors, trucks, and more.
  • Do more with Genius - Designed for 6-volt and 12-volt lead-acid automotive, marine, and deep-cycle batteries, including flooded, gel, AGM, and maintenance-free, plus lithium-ion batteries.
  • Enjoy precision charging - An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climates.
  • Charge dead batteries - Charges batteries as low as 1-volt. Or use the all-new force mode that allows you to take control and manually begin charging dead batteries down to zero volts.
  • Restore your battery - Automatically detects battery sulfation and acid stratification to restore lost battery performance for stronger engine starts and extended battery life.
  • Beyond maintenance - It's not just a trickle charger, it's an advanced battery maintainer. A fully-automatic, worry-free battery charger for everyday use - 24/7 - with zero overcharge.

LST 12V Battery Trickle Charger Maintainer Portable Smart Float Charger for Car Motorcycle Lawn Mower SLA AGM GEL CELL WET Lead Acid Batteries

Based on 2 reviews Check latest price
  • √ Perfect for all 12V lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell); It's smart car battery charger for automobiles, automotive, marine, boats, camper, trolling motor, RVs, ATVs, watercraft, powersport, riding lawnmower, lawn tractor, snowmobiles, etc.
  • √ Safety Guarantee - Multi protection against Reverse polarity/ Short Circuit/ Over Voltage/ Over Current/ Overload/ Overheat; Spark proof during lead connection; Water and dust resistant float charger, full-loaded and burn-in test proves its stable performance and high reliability.
  • √ 4-Stage Automatic Charging - Features with detachable ring or alligator connectors, charge and maintain your battery wherever you go; the battery maintenance charger monitor the whole charging process, automatically switches to float mode after fully charging the battery by MCU controlled; LST motorcycle battery charger will recover batteries more effectively and extend the battery life.
  • √ Intuitive LED Indicator - 12 volt automotive battery maintainer charger provide visual state-of-charge feedback and diagnostic information, even when in maintenance mode. Input 100-240V, ultra-compact and lightweight, easy to carry the 12v battery charger everywhere.
  • √ 100% Satisfactory Float Charger - You will get awesome trickle chargers for 12 volt batteries with decent package; LST trickle battery charger offer 3-Year quality assurance & 12-Month refund & timely after-sale services.

User questions & answers

Question: How do I know which Stage it is charging on
Answer:
Question: On my charger it shows all the green lights. Its green light in 0-50 and 50-100 and also green on standby. Is that normal
Answer:
Question: Is this a dual voltage that I can use overseas with 220v outlets
Answer:
Question: Is there some warranty
Answer:

Product features

4 STAGE- CHARGE & MAINTAIN MODES

1. Desulfation - Detects battery sulfation or severe discharge.

2. Bulk charge - Using highest rated current till 80% capacity.

3. Absorption - Till its full capacity without overheating.

4. Float - Maintain the battery through pulse charging.

Warm Tips: If battery stays at stage 2 after 24 hours of charging, the battery is defective.

Fully Automatic

No need of any manual operation, just plug and leave it.

Reverse Polarity Protection

Checks for the correct connection before giving power.

Sparkproof

Only give power with correct connection with batteries.

Quick Disconnect Harness

Connect and disconnect the 12 volt trickle chargers in seconds.

INTUITIVE LED INDICATOR

2 LED indicator for battery charging 50%, 100%.

Diagnostic & Recovery

The Fault light ON when detecting reverse polarity,short circuit or damaged batteries.

Applies a high-voltage pulse charge when low-voltage, sulfation or lost capacity is detected.

REFERENCE CHARGING TIME

Charge Battery : 3-30AH

Maintain Battery : 3-45AH

Note: LST battery float charger can be used with larger capacity battery,

just longer charging time, no damage to your battery.

MULTI-LEVEL SAFETY

MCU Controlled

Assuring correct level of power is sent to the battery at all times.

Connect and Forget It

Once connected, the motorcycle trickle charger manage your

battery' s health on it' s own.

PACKAGE CONTENTS

- 1 x Battery Charger & Maintainer

- 1 x Alligator Clips for an alternate connection

- 1 x Fused Ring Terminal Harness for hard to reach spaces

- 1 x Instruction Manual

12V to 14.8V Automatic Lead Acid Battery Charger/Maintainer, 1.2A Trickle Charger for car, Truck, Boat, Motorcycle, RV, Lawn Tractor

Based on 14 reviews Check latest price
  • TRICKLE CHARGER ----- It can charge all types of 12V lead-acid batteries, including flooded or sealed maintenance free batteries (AGM & gel cell). It's the best smart charger for car, truck, boat, motorcycle, RV, lawn tractor, or any other vehicle with a 12-volt battery.
  • FULLY AUTOMATIC ----- No need of any manual operation, just plug and leave it for charging and maintaining your batteries automatically for long time. The microprocessor controlled program will monitor the whole charging progress and automatically stop when the battery is fully charged. Then it will monitor the battery voltage and maintain the battery with a float charging current.
  • MICRO-PROCESSOR CONTROLLED PROGRAM ----- No worry about overcharge, short circuit and reverse polarity. Spark-free technology applied. Safer floating charger with maximum voltage up to 14.8 volts.
  • EASY OPERATION ----- Energy Saving design with one LED indicator to display different charging status. Simply hook up the charger to the battery, plug it in and walk away. Note: be care of the clip positive and negative electrode (Red = positive, Black = negative)
  • ORION MOTOR TECH ----- We pursue outstanding quality and professional technical support. If you are not satisfied with this product or if you have any question, please feel free to let us know.

User questions & answers

Question: Do the battery terminal have to be disconnected to use this product
Answer: The instructions say, "To start charging, first connect the charger to the battery, then plug in the AC line cord. To stop charging, first disconnect the charger from the battery, then unplug the AC line cord." If this charger is being used to charge a battery in a system (like a car), I would recommend disconnecting the battery from the system. Automobile systems may require initialization after reconnecting the battery.

Product features

Specifications

Model: 12V/1.2A

Dimensions: 3.8 x 1.9 x 2.2 inches

Output Voltage Rating: 12-14.8V

Input Voltage Rating: 110-240V

Recommended Battery Capacity: 12V / 7-10Ah

Input Frequency: 50-60HZ

Maximum Output Power: 15W

Ripple: ≤120mV

Efficiency (at 100% load): ≥85%

Current Limit: 1.2A

Leakage Current: ≤0.25mA

Working Temperature: 50°F - 122°F

Working Humidity: 5% - 95%

NOCO Genius G15000 12V/24V 15 Amp Pro-Series Battery Charger and Maintainer

NOCO

Based on 576 reviews Check latest price

Product description

NOCO Genius smart battery chargers are some of the safest and most advanced on the market. One of our best, the G15000 15 Amp is designed to charge 12-volt and 24-volt lead-acid and lithium-ion batteries up to 400Ah. It can also effectively maintain automotive, marine, RV, lawn & garden and deep-cycle batteries. It charges 2x faster than ordinary battery chargers, can jump start dead batteries, repair damaged batteries, power DC devices and is designed to use with micro-hybrid start-stop vehicles and CANBUS electrical systems. Guided by an onboard microcomputer, the G15000 monitors battery activity for safe and efficient charging, automatically minimizes energy consumption and provides redundant levels of safety protection, including spark-proof technology, as well as reverse polarity and overcharge protection. It can remain safely connected 24/7, while its streamlined design makes it ultra-compact, portable and incredibly lightweight. The G15000 features external mounting holes and a rubberized base that avoids surface slipping and scratches, all while remaining impact, UV and water-resistant (IP44). Intuitive LED indicators provide visual state-of-charge feedback and diagnostic information, even when in maintenance mode. Designed for use on 120-volt, 50-60Hz electrical systems, the G15000 includes HD X-Connect battery clamps with detachable eyelet terminals and a 5-year limited.

  • A powerful, professional grade battery charger and battery maintenance tool designed to recharge all types of batteries rapidly in workshops, garages or those you simply want the best.
  • Perfect for keeping your vehicles fully charged and maintained during year-round battery maintenance or long-term storage for improved performance and longevity. Power consumption: 255 watts (Max)
  • Works with all types of 12-volt and 24-volt lead-acid batteries, including wet, gel, and AGM, or any common automotive, deep-cycle, marine, or maintenance-free battery.
  • Keep your battery fully charged without worry or overcharge. Simply plug-in and let our advanced charging technology automatically monitor and maintain your battery. Progressive repair mode for heavily sulfated 12v batteries.
  • Use our advanced repair mode to reverse the damaging effects when batteries are left uncharged for extended periods to improve battery performance and longevity.
  • Convert the battery charger into a 5-amp constant-current, constant-voltage power supply for maintaining onboard computer member during battery changes or as a DC power source.
  • An optimized charge mode for safely charging and maintaining 12-volt lithium-ion batteries, and recommended with use on lithium batteries with an internal BMS.
  • One of the most advanced and safest battery chargers, including spark-proof technology, and reverse polarity protection, plus backed by our 5-year and endless accessories.

User questions & answers

Question: Which model is a maintainer and jump starter
Answer: G15000 and G26000 both are a maintainer and Jump Starter. I verified. but you need to wait 5 minutes to JUMP START a DEAD battery vehicle. Beware, YOU CAN ONLY insert the power plug into the wall power outlet AFTER you connect the battery. When you are connected, then insert the power plug and then, PRESS the JUMP CHARGE and WAIT for 5 minutes. YOU WILL BE impressed after 5 minutes.
Question: will it jump the engine
Answer: Yes. It can. I verified this function. It's called 5 minutes' JUMP CHARGE. but always remember, Insert the power plug ONLY AFTER you connect the battery. when you are done connecting the + and - terminal of the battery, THEN you can insert the power plug into the wall power outlet. It will take 5 minutes to charge the DEAD battery from Zero back to LIVE enough to JUMP-START your vehicle. I approved this message. It works!
Question: The descripition says it can jump start. Has anyone used that feature
Answer: The G15000 features a 5 minute, 20A Jump Charge mode that can be used to rapidly increase the voltage on a heavily discharged battery. It jump starts all kinds of 12V vehicles though the process may need to be repeated two to three times for larger vehicles.
Question: Is this actually made in the usa or assembled in the usa or made in china
Answer: Too late I'm sure, but maybe someone else will benefit - it doesn't have a battery, you can't "charge the charger". Mains powered only. Lol. Item itself is not labeled as to location of manufacture. Purchased December 2020. As of February 2021 it's discontinued.

Product features

9 Chargers In One

Charges 12V & 24V lead-acid batteries (including AGM and more) and 12V lithium. Repairs desulfated batteries, charges in cold conditions, and has a 13.6V Supply mode. Also includes JumpCharge (see below) for starting dead batteries.

Diagnostics

Intuitive visual diagnostic tool for detecting reverse polarity, low-voltage or damaged batteries.

Recovery

Applies a high-voltage pulse charge when low-voltage, sulfation or lost capacity is detected.

CANbus

Automatically enables the charging port to charge CANbus systems.

Maintenance Plus

Keeps the battery fully charged without overcharging, indefinitely.

Optimization

Stabilizes internal battery chemistry for increased performance and longevity.

Interactive

Alters the charging process based on organic battery feedback.

Energy-Save

Minimizes energy consumption when full power is not needed.

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