13 best charger for car batteries

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.

• ➤【Wide Application】 This intelligent battery charger is designed for all types 12V and 24V lead-Acid batteries that within 6-150Ah(12V), 6-100Ah(24V), including AGM, GEL, SLA, Flooded (WET), or any common automotive, deep-cycle, marine, or maintenance-free battery. Note: Lithium battery is prohibited. Compatible with all types of vehicles - charges and maintains, electric vehicles agricultural vehicles, off-road vehicles, pickup trucks, boats, yachts, motorboats, and more
• ➤【Effective Reparation Mode】Automatic sulfa-ting and acid stratification detection, One Key to Repair, Activate Battery, Pulse repair function can help to repair your loss battery and extend battery life. Note: It can not activate a dead battery or repair a battery which is damaged seriously; it also can not repair a battery back to 100% new
• ➤【Automatic Charging】Automatic detection of 12V or 24V battery, automatic monitoring of the entire charging process through a microprocessor-controlled program. Automatically adjust the charging current, easy to deal with a variety of harsh voltage environments. This 24V 12V car battery charger ensure the adaptive charging process, with maximum safety, and automatically stop when the battery is fully charged
• ➤【Safety Charging】Adopt ABS flame-retardant shell, fireproof, electric shock, corrosion resistant, solid and durable, Built in circuit protection guards against reverse polarity, sparks, overcharging, over-current, open-circuits, short-circuits and overheating. Smart LCD display shows the charging status and battery status to make you more assured of charging
• ➤【Robust Quality and Service】Automotive Battery Charger has a durable and efficient design. With well-experienced engineers and dedicated support team, we are always standing by your side and ready to help you. If you have any questions, please feel free to contact us by email

User questions & answers

Question:	Can I usw this for jump starting a car
Answer:	I am afraid not, but the other item G27P jump starter in our store can jump start your car, please refer to the following link for details: https://www.amazon.com/SUHU-Battery-Starter-Booster-Portable/dp/B08NWR766M
Question:	Can it be used to charge a battery fitted to a Ford Kuga 2015 diesel automatic
Answer:	I am sure it will work well, hope this helps.
Question:	How long are the battery leads? How long is the power cord
Answer:	Hello, the battery leads are 21.5 inch, and the power cord is 23.5 inch.
Question:	It charge and maintain 12v deep cycle 100mA battery
Answer:	It should be able to

Product features

Easy to Use

Be sure all accessories are off, connect the ground cable(-)/(+), jump the smart battery charger, it will do the rest.

Compatible with Most Batteries

Works with all types 12V and 24V lead-Acid batteries including AGM, GEL, SLA, Flooded (WET), or any common automotive, deep-cycle, marine, or maintenance-free battery. But not for lithium battery.

Battery Desulfator 12V/24V

Repair mode can repair the effects when batteries are left uncharged for extended periods to restore battery life and conditions flat batteries.

Easy to Carry

Suitable for outdoor use. Portable and powerful

Product description

Charge or jump start your SUV, truck, or large battery with the Schumacher SC1281 6/12V Fully Automatic Battery Charger and 30/100A Engine Starter. Contains battery and alternator tester which provides charge level and helps diagnose electrical problems. Features 30A for quick energy boost and 100A to jump start your car right away. Microprocessor controlled, multi-stage charging adds precision, safety and battery life. Built-in reverse hook-up protection prevents charger from operating if clamps are reversed. LED indicators and Start/Stop push button interface improves accuracy and ease of use. Features auto voltage detection to easily detect 6 or 12V batteries. Meets the highest industry standards with its Schu Eco Energy. DOE compliant. Compatible with standard, AGM, gel, and deep-cycle batteries.

• Features 30A quick boost and 1H2:L1600A jump start, powerful enough to start SUVs, trucks and large batteries
• Battery and alternator tester provides charge level and helps diagnose electrical problems
• Features multi-stage charging and auto-voltage detection for added precision, safety and battery life
• Reverse hook-up protection ensures charger will not operate if clamps are reversed
• Charges compatible battery types, including standard, AGM, gel and deep-cycle batteries

User questions & answers

Question:	Does this charger have a desulfation mode on it
Answer:	The manual talks about a desulfation mode existing, but does not say how to trigger it, or whether it is part of the automatic charging system. https://www.batterychargers.com/sites/default/files/manuals/0099001912E-R3.pdf page 8.
Question:	What does the 2/6 mean? Is this the trickle or battery maintenance mode info
Answer:	Starts at a moderate 6 amp charge reducing to 3 amps as charging nears completion.
Question:	Is it portable
Answer:	Light and portable, but needs a 120volt outlet, or a long(100' extension cord) to far distances.
Question:	Is this a 4 stage charger (bulk, absorption, float, equalization
Answer:	The SC1281 does, Bulk, absorption, equalization, desulfation and maintenance features

Product description

Introducing the all-new GENIUS10, making it one of our most powerful, highest-performing, energy-efficient, and compact charger yet. The GENIUS10 is a 6-volt and 12-volt battery charger, battery maintainer, trickle charger, and battery desulfator, rated at 10-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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• GENIUS10 - Similar to our G7200, just better. It's 17% smaller and delivers 115% more power. It's the all in one solution battery charger, a 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

• Imazing POWERFUL CAR JUMP STARTER: With 2000A peak current, it can jump start (Up to 10.0L Gas or 8.0L Diesel) 12V cars, motorcycles, ATVs, UTVs, lawn mowers, snowmobiles and etc. up to 30 times on a full charge.
• SAFETY PROTECTION: With UL2743 standard certification and the LCD intelligent clamp of 8 advanced safety protection technologies(Reverse polarity, reverse connection, over-current, overload, over-voltage, over-charge, over-discharge, short circuit), Imazing jump starter provides ultimate protection for your safety.
• FAST CHARGING: Designed with dual USB output ports and one Type-C in(out) port, the quick-charge 3.0 USB port provides the fastest charging speed and is compatible with almost all USB charging devices, including phones, tablets, cameras, kindles and etc.
• LED FLASHLIGHT: Imazing jump starter has a built-in LED flashlight with 3 modes: Flashlight, SOS, Strobe. It's an life saver for camping, outdoors, emergencies, travel, etc.
• WHAT YOU GET: 1 x Jump Starter, 1 x Carry Case, 1 x LCD Smart Clamp, 1 x Type C cable/Charge for jump starter, 1 x Cigarette Lighter Adapter, 1 x User Manual and 2 years warranty. Imazing offers working days live chat on FB page, search “Imazing” on FB if you have any problems for shopping.

Product features

Rated 2000A /12V 18000mAh

Suitable for up to 10L Gas or 8L Diesel, can jumpstart cars,vans,boats,suvs,trucks and more.

(New jump starter must be charged before use.)

Easy to carry on

It can come in especially handy for those who are camping or traveling. You will never have to worry about having a dead phone or a dead vehicle and being stuck in the middle of nowhere.

What Imazing jump starter can do for you:

• 【WIDE RANGE USE】:🔋 Diagnose and repair various battery problems, including flooded or sealed maintenance free batteries. Pulse repair function can help to repair your loss battery and extend battery life. Suitable for all kinds of vehicles, lithium battery or lead-acid battery: automotive, motorcycle, marine, RV, Powersport, lawn&garden, children toys, and more. Perfect for keeping your vehicles fully-charged and maintained during year-round battery maintenance or long-term storage.
• 【FAST CHARGING】:🔋 The charger is designed for 12V/24V batteries. Input voltage: 100-240V AC, Battery range:12V/10AMH(max); 24V/7.5AMH(max). Automatically adjust the charging current, easy to deal with a variety of harsh voltage environments, quickly charge the battery. Suitable for charging any lead acid, Flooded(WET), GEL, Calcium type deep cycle, VRLA,12.4-12.8V polymer lithium battery,maintenance-free and AGM batteries of capacities up to 6-105Ah (Amp-hours).
• 【MULTILEVEL SAFETY PROTECTION】:🔋 Built-in circuit protection guards against reverse polarity, sparks, overcharging, over-current, open-circuits, short-circuits, and overheating. Avoid any dangerous situation. ideal for carefree long-term maintenance charging. Don't worry about security.
• 【INTELLIGENT LCD DIGITAL DISPLAY】:🔋 The automatic smart charger can display/current/voltage easy to operate, intelligent charging, without manual adjustment, making it easier to charge your battery. Automatic mode of battery charger: fully intelligent charging and maintenance of battery, no extra operation required. Manual mode: adjust the charging mode, for example, you can continue charging after the automatic mode is charged.
• 【Outerman WARRANTY SERVICE】:🔋 The battery charger has a one-year warranty. We have enough confidence in our battery charger, if you have any questions, please contact us by email. We will reply to you as soon as possible and give you a satisfactory solution. Package includes: 1 battery charger.

Product features

Multifunctional Car Charger

Outerman battery charger can not only charge lead-acid batteries, it can also charge lithium batteries, suitable for all 12V / 24V lead-acid batteries and lithium batteries. And has a powerful self-protection function, allowing the battery to charge safely.

• Fast, Smart Battery Charger: The Battery Charger can charge all types of 12V Lead-acid Batteries, including GEL, AGM and STD. It is perfect for charging Automotive, Motorcycle, Marine, RV, PowerSport, Lawn & Garden, etc. Do not charge a frozen or dead battery that has gone below 3V.
• 7-Step Charging Program: Desulphation, Soft Start, Bulk Charge, Absorption, Battery Test, Recondition and Floating. This allows for optimization of battery power, without overcharging or damaging.
• Advanced Start Aid: Engine Start Aid feature can help start your vehicle in about 120 seconds.
• Auto Detect Systems: Features Battery Voltage detection, then automatically selects charge rate for charging and maintaining. Battery reconditioning feature helps extend battery life. LCD screen displays charging status and battery status with easy to understand icons.
• Safety Protection: Battery Charger has Over Voltage, Over Heat, Overtime Charging, Short Circuit, and Reverse Polarity Protection to ensure users safety.

Product features

TowerTop Smart Battery Charger/Maintainer

• Charges 12 Volt Lead Acid batteries including Standard, AGM, GEL, and Sealed Lead Acid.
• LCD screen displays charging status and battery status with easy to understand icons.
• Start Aid function can optimize the power of your battery in only 120 Second, giving you enough power to start most cars.
• Warning:
• For 12V battery only, not to be used with 24V battery.
• Do not charge a frozen or dead battery that has gone below 3V.

7-STAGE CHARGING AND MAINTENANCE MODES

1. Desulphation: Pulse charges the battery to break down the build-up of lead sulphate crystals. Lead sulphate crystals can occur when a battery has been discharged or left unused for a period of time, seriously affecting the performance and lifespan of the battery.

2. Soft Start: A slow steady buildup of the charging process that limits the power supplied to protect the battery.

3. Bulk Charge: The main part of the charging process where 80% of the charge is applied.

4. Absorption: Fully charges the battery by slowly reducing the charge rate to allow the battery to absorb more power.

5. Battery Test: An automatic test to determine the battery condition after charging. If further charging is required, the Recondition stage is selected. If fully charged, the battery goes into Float status.

6. Recondition: Unique charge state to recover deeply discharged batteries.

7. Float: Maintains the battery at 100% charge without overcharging or damaging the battery, allowing the Smart Charger to be left connected to the battery indefinitely.

How the charger protects you and your battery?

TowerTop Battery Charger Stringently lab-tested in UL (Underwriters Laboratories) certified testing facilities. The Charger has UL/FCC certification.

Battery charger/maintainer has multifunctional Safety technology including short circuit protection, spark-free system, reverse polarity protection, overcharge protection,over-voltage protection, temperature protection, making it totally safe for anyone to use.

This allows you to safely maintain and extend the battery life of your lead-acid batteries while allowing your vehicles/equipment to operate more efficiently and stably.

Charging time(T)= battery capacity(Ah) / charging current(A)

Excellent ABS Shell

• Hard, excellent impact resistance
• Good flame retardancy
• Corrosion resistance
• Good electrical insulation
• Widely used in automotive, electronic communications, construction, etc.

Unique Storage Cables Design

• It easily solves your troubles with storing cables.
• After use, you can quickly store your cables.
• No more wasting your time.

What is the size of the charger?

• Item Weight: 5.25 pounds
• Power plug cable length: 6FT
• Battery clip cable length: 6FT
• Charger Dimensions: 10.1 x 6.9 x 4.7 inches

All-Inclusive Battery Clip

• Insulated all-inclusive chuck, no need to worry about leakage
• Bold inner core, stable current, no damage to battery
• Large bite force, not fall off

Fully Automatic System

With Smart Detect System, Automatic current selection, Automatic Identify Low Voltage, Automatic Stop After Full-charged.

Smart Cooling Fan

Smart fan with fan controlled function. In the normal charging process, when the charger is in constant current and constant voltage state (when the current is greater than 3.5A or the temperature is greater than 122℉), the fan works normally.

Lightweight & Portable Design

Ergonomic design, the flexible handle makes the charger more portable. It’s a great addition to your tools for your car.

• Versatility & Efficient: 12V-2/10/40A, 6V-2/40A charging rate, automatic wheeled charger and maintainer for 6 and 12 Volt batteries, perfect for charging SUVs, trucks and other large engines.
• Microprocessor Controlled: BILT HARD automotive battery charger features intelligent multi-stage charging that provides maximum improvement for safety, battery performance and battery life.
• Advanced Protection: BILT HARD car battery charger is ETL certified, it features automatic battery test that helps diagnose electrical problems. There is also a protection system for overheat, overcharge, reverse polarity and short circuit. NEVER CHARGE A FROZEN BATTERY.
• Jump Starter: The car battery charger delivers 40A boost and 200A engine start to help start your SUV, truck or other large vehicle.
• LED Indicator： The truck battery charger is designed with LED indicator that simply displays differnt charging status, modes, charging voltages, charging amps and error information. PLEASE MUST REFER TO THE USER MANUAL BEFORE USING.

User questions & answers

Question:	Does the engine starter feature include 6V or just 12V
Answer:	Engine starter feature is just 12V.
Question:	can it be use with a current of 220v
Answer:	No

• 【All-in-one Battery Charger】KONNWEI KW510 is a professional 3 in 1 battery tester, battery charger, battery maintainer(pulse repair), trickle charger and battery desulfator. The large color LCD display and button-operated features will be more convenient compared to other similar products.
• 【Accurate Battery Tester】running for years but no idea about battery status? KW510 12v battery tester provides you an overall analysis of battery health by checking its voltage charge, internal resistance then tells you whether the battery needs to be recharged. Also this battery tester runs cranking and charging system test and car alternator tester charging.
• 【Fully Automatic Battery Charger】charge batteries as low as 2-volt, max output 12-volt 5-amp. KW510 battery charger not only helps you charge the batteries but also adapts the newest pulse repair technology, one-click repair and automatically detects battery sulfation and acid stratification to bring the batteries back to life and restore their performance.
• 【Universal Compatible】KW510 can test, charge and repair all 12-volt 100-2000CCA lead-acid batteries including regular flooded, AGM flat plate, AGM spiral, or gel batteries. The perfect automotive battery tester to diagnose the batteries of cars, boats, lawnmowers, etc.
• 【Highest Safety Priority】safety charging is the most important thing! Except the smart temp compensation that fits all climates and auto change to low current mode after fully charged, KW510 also supports up to 8 kinds of protection like reverse polarity, overload, over-current, overheat, cooling system, fireproof material, short circuit protection, etc.

User questions & answers

Question:	Will the battery charger drain the battery if the AC power fails
Answer:	It won't, when the AC power fail, KW510 battery charge won't drain the battery
Question:	Will this work with a 12v 600cca 65amp hour deep cycle marine battery
Answer:	Yes, KW510 battery charger will work with a 12v 600cca 65amp hour deep cycle marine battery
Question:	How do you know your batteries need to be charged? Does this charger have a battery test function
Answer:	This is a 3 in 1 battery tool, you can use its battery tester function to test your battery, then decide whether to charge or repair battery accoding to the testing results.
Question:	Will this charge a completely dead agm battery
Answer:	Yes, KW510 can charge dead battery, down to 2 volts

Product features

KONNWEI KW510 Powerful 3 in 1 Multifunctional Car Battery Charger, Repair and Test Tool for All Types 12V Lead-acid Batteries

KONNWEI KW510 Battery Tester adopts the state-of-the-art conductance testing technology in the world to easily, quickly and accurately measure the actual cold cranking amps capability of the vehicle starting battery, healthy state of the battery itself, and common fault of the vehicle starting system and charging system. With a wide testing range from 100 -2000CCA compatible with regular flooded, AGM flat plate, AGM spiral, or gel batteries. Covers most of the battery rating standards like CCA, BCI, CA, MCA, JIS, DIN, IEC, EN, SAE, etc.

Why do you need to know battery conditions (Good or Recharge)?

Plug and play--input the rated battery capacity, KW510 will start analyzing the battery's CCA value, charge (%), voltage (v), internal resistance (Ω), rated CCA, battery healthy (%) and display the test result on screen within seconds.

ACCURATE RESULTS

High precision amplifier and calibrated by professional instruments give you the reliable results in seconds!

CRANKING & CHARGING TEST

CRANKING TEST : Analyzes the actual cranking voltage and the cranking time to help you quickly figure out the whole state of the starting system;

CHARGING TEST : Test different parts of charging system, including generator, rectifier, rectifier diode, and so on for a reliable charging volt value.

CONVENIENT TESTING SITUATION

No matter the batteries in the vehicles or out of the vehicles, KW510 will finish its testing job excellently, pocketed size let you can bring it to anywhere you want.

FITS FOR MOST VEHICLES

Designed for testing and charging 12-volt lead-acid automotive, marine, and deep-cycle batteries, including flooded, gel, AGM, and maintenance-free, plus lithium-ion batteries.

Compatible with all types of vehicles - charge and maintain cars, motorcycles, lawn mowers, ATVs, lawn tractors, trucks, SUVs, boats, PWCs, classic cars, and more.

AUTOMATIC FAST CHARGING

Max output 12-volt 5-amp, input 100-230-volt, charge dead batteries as low as 2-volt.

Automatic monitoring of the entire charging process through a microprocessor-controlled program. Auto change into low current mode after fully charged.

ENHANCED PULSE REPAIR

Automatic sulfating and acid stratification detection, the advanced repair mode can repair and reverse the damaging effects when batteries are left uncharged for extended periods to improve battery performance and longevity. (Note: The pulse repair function can only be used when the car battery is disconnected from the car.)

MULTIPLE PROTECTION

Short circuit / Overcurrent protection / Overheat protection / Fireproof material / Low pressure protection / Overpressure protection / Mislink protection / Electrification protection ) the charger will automatically turn off the power supply to protect the battery and charger.

Product description

The STANLEY BC25BS bench battery charger features a 75 amp engine start, which helps start your vehicle in about 90 seconds. If you are looking for battery maintenance instead of a jump start, once connected to your vehicle battery the bench battery charger does the rest for optimum performance. Our fully automatic high frequency maintenance charger delivers 3-stage charging and automatically switches from fast charge to top-off to trickle charge. This bench battery charger is ideal for motorhomes, boats, jet skis, lawn tractors, ATVs, snowmobiles, and vehicles that sit idle for months at a time. It is able to charge and maintain any AGM, GEL, or WET automotive or marine 12V battery. It's equipped with a digital LCD screen that displays charging status and battery status with easy to understand icons. It also features a patented alternator check to evaluate the battery voltage under load to indicate if the alternator is maintaining battery level. This battery charger eliminates the need to manually input settings like battery type and size, and charges up to 40% faster than other conventional chargers. The built-in cord, cable wrap, and clamp storage make this battery charger easy to use and store. It is also California Energy Commission (CEC) compliant and ETL Certified for performance and safety.

• Dependable and safe to use; In an emergency, the 75-amp engine start helps jump start your vehicle in about 90 seconds
• Successfully maintains the battery on any AGM, GEL, or WET automotive or marine 12V battery with the push of a button
• High-frequency smart charging technology keeps battery at an optimal charge and automatically switches from fast charge, to top-off, to trickle charge
• Allows you to monitor and charge your battery in the quickest and safest way possible; Provides extended longevity
• Front of battery charger features four different options; LCD screen displays battery status with understandable icons

User questions & answers

Question:	If a little rain wet this charger would it mash up
Answer:	If the charger got wet, take it in the house and let it COMPLETELY DRY OUT. Let it dry for a DAY OR TWO. Don't even think about using the charger if it hasn't dried out!
Question:	Can I use this to jump start my vehicle if I do not have access to a power source
Answer:	Yes, it's the first item in the description: "In an emergency, the 75-amp engine start helps jump start your vehicle in about 90 seconds."
Question:	Working with 220 volts imput
Answer:	NO This unit is for 110 volts only. DO NOT USE WITH 220 VOLTS.
Question:	I have a full size chevy 1500 would the engine start feature crank my truck with an almost dead battery
Answer:	Turn off all accessories and and proceed to crank as you normally do. the starter is still 12 volt, there's no reason that your engine should not start, I haven't considered the diesel starting possibility, but start as one usually would,and Idont forsee any problem. I've had to only use this feature once, but it worked as designed, I like this product, and recommend to other undecided, possible buyers. :-) Augusta Ks. 4-3-17

• 🚗✔ Smart Fast Charger: 2A / 8A / 15A / Auto charging rate, fully automatic high frequency charging for all types of 12V lead acid batteries, including GEL, AGM and STD. Not only do you choose the charging rate manually, but also the optimal function can automatically select the charge rate best fit for your type of battery.
• 🚗✔ Excellent Winter Charging Mode: Specialized design for charging battery in winter weather conditions to sustain a longer life of battery and to ensure perfect charging
• 🚗✔ Safety Protection: Microprocessor-controlled, with multi-stage charging for added precision, safety, and battery life. No worry about battery Over Voltage, Over Heat, Overtime Charging, Short Circuit and Reverse Polarity
• 🚗✔ Advanced LCD Display: Intuitive words and vivid icon, easily keeping track of charging status, charging current, voltage, battery type, and error information
• 🚗✔ Complete 6-step Charging Program: Desulphation, Soft Start, Bulk Charge, Absorption, Battery Test and Floating, allow for optimization of battery power, without overcharging or damaging. Household Use Only. (Do not charge a frozen or dead battery!)

User questions & answers

Question:	What is the warranty for th
Answer:	The user manual does not say anything about slow charging; it might charge the battery to a point if connected to it but it won't be slow. The car battery charger can charge small electronic devices via USB ports, but the charging circuitry that controls, monitors and limits the amount of current that goes to charge these devices is in the small electronic device itself. Customer support might be able to give you a better answer. The customer support number for the car battery charger is listed as 1 (888) 965-5888 in the user guide.
Question:	does this work with optima yellow top battery
Answer:	The cables are about 8 inches long not including the clips. However since the power pack is only a little larger than a cell phone it is easy to get it within a couple of inches of the battery posts so the cables do not have to be long to reach. That is the great thing about these little starters....they work without having to have space to maneuver a car or to need long cables.
Question:	Why does it say not to charge a dead battery in the warnings? Is that not what it’s meant for
Answer:	It charges using a provided USB-C cord but you must provide the wall or auto charger.
Question:	Charger says to connect cables when they are connected
Answer:	The instructions say at least 20%.

Product features

MCU Controlled Program

Intelligent microprocessor monitors the attached battery's voltage level from the moment it is connected, using this ever-changing data to improve the charging system's multi-stage charging cycle, resulting in quicker charge times and a lessened chance of damage due to overcharging.

High Voltage Reconditioning

Charger adopts high voltage up to 15.8V to stimulation battery, mainly for the bad battery caused by short circuit or low-softening plate. The working cycle is five cycles. If the charger test concludes that the battery is still less than 12V after the repair cycle, the dead battery is determined.

Comfortable and Easy-to-Carry Handle

Unique handle adopts Arc design, with high comfort, has good ergonomics that minimize the possibility of experiencing aches and cramps.

Reliable Cooling System

Features with one cooling fan and reliable cooling vent to disperse heat and increase charging efficiency. When the charger is in constant current and constant voltage, the cooling fan would works.

Durable ABS Shell

Applies the technology of ABS material, great insulation, anti-falling, sturdy and durable.

Convenient Cables Storage

It is easy and convenient to use and store alligator clip and power cord.

• 【Upgrade Battery Charger】 - GEMWON GW358 is a portable and high performance battery charger. It just 0.45KG, use ABS shell make it flame retardant, anti-conductive and anti-corrosion. The high density soft copper wire help it no fever after working long time.
• 【Compatibility】 - Our auto battery charger works with all types 12V/2AH-12-AH lead-acid batteries (not for lithium battery). The maximum output current is DC-7A. There are four modes (STD/AGM/MOTO/REPAIR) for vehicles, boats, SUV, lawn mowers, trucks, motorcycle, motorboats and more battery charging.
• 【7-Stage Charging Protection】 - GW358 is an smart battery charger and advanced battery maintainer. It has 7-stage charging process to protect the battery and stop the charging automatically when battery is fully charged.
• 【Temperature Compensation】 - This battery charger can detect the ambient temperature and adjust the charging voltage according to the temperature. It will increase voltage in winter and reduce voltage in summer.
• 【Repair Your Battery】 - The advance repair mode can detect battery sulfating and acid stratification. Restore lost battery performance and extended battery life.

User questions & answers

Question:	What is the Length of cord
Answer:	The cord is about 2 feet long, so you will definitely need an extension cord.
Question:	Is the battery charger ok to start the engine
Answer:	No, it's not a starter.But you can be able to start the engine after 10-15 minutes of charging.
Question:	do the battery side leads unplug for substitution of longer leads or lighter plug adapter
Answer:	No
Question:	What is the input voltage range ? Is 110v or 220v charger
Answer:	The input voltage range is AC110v to 255v, can work for difference environment.

Product description

The GB40 is an ultra-portable, lightweight, and compact portable lithium car battery jump starter pack for 12-volt batteries. With it, you can safely jump start a dead battery in seconds - up to 20 times on a single charge. It's a mistake-proof portable car battery jump starter battery booster pack, making it safe for anyone to use and features spark-proof technology, as well as reverse polarity protection. The GB40 portable car battery jump starter integrates with a high-output 100 lumen LED flashlight with 7 light modes. Including low, medium, high, flashing, strobe, and emergency SOS. It can hold its charge for up to one year without being recharged. Its internal battery can be used to recharge any personal mobile devices like smartphones, tablets, or any other USB device, can be recharged by any powered USB port. It's rated at 1000-amps, and suitable for use on gasoline engines up to 6 Liters and diesel engines up to 3 Liters, such as a car, boat, lawnmower, and more. Included is the GB40 battery booster jump starter pack, heavy-duty battery clamps, USB charging cable, 12-volt USB car charger, microfiber storage bag, a 1-year limited, and lifetime customer support. 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• Start Dead Batteries - Safely jump start a dead battery in seconds with this compact, yet powerful, 1000-amp portable lithium car battery jump starter pack - up to 20 jump starts on a single charge - and rated for gasoline engines up to 6 liters and diesel engines up to 3 liters.
• UltraSafe - Safe and easy to use car battery jump starter pack without the worry of incorrect connections or sparks. Safely connect to any 12-volt automotive car battery with our mistake-proof design featuring spark-proof technology and reverse polarity protection.
• Multi-Function - It's a car jump starter, portable power bank, and LED flashlight. Recharge smartphones, tablets, and other USB devices. It's easily rechargeable from any powered USB port in 3 hours at 2.1-amps. Plus, an integrated 100-lumen LED flashlight with seven light modes, including emergency strobe and SOS.
• Advanced Design - Our most advanced portable car battery jump starter ever. Featuring high-discharge lithium technology for safe operation in any climate. A rugged and water-resistant enclosure rated at IP65. A rubberized over-molded casing to prevent scratching or marring of surfaces. And an ultra-compact and lightweight design weighing just 2.4 pounds.
• In The Box - GB40 UltraSafe Portable Lithium Car Battery Jump Starter Pack, Heavy-Duty Battery Clamps, 12-Volt Car Charger, Micro USB Charging Cable, Microfiber Storage Bag, User Guide, 1-Year Warranty, and Designed in the USA.

User questions & answers

Question:	What is the operating temperature range? Can it be safely left in the hot car in the middle of summer (180 degrees or more
Answer:	Dear Value Customer, Yes, the jump starter can be charged in other countries. All chargers that support USB cable could be used to charge the jump starter.Our package includes a charging head, so please don’t worry.
Question:	How long does the charge for the jumper last. dead batteries are few and far in between. If i were to charge it will it last a year, 2 years
Answer:	I jump started a 2006 Jeep Commander 3.7L and it still had 3 dots of battery left.
Question:	Will this start a Gel Battery
Answer:	2000A Peak Current
Question:	Is this capable of starting up a V8? and I don't mean the tomato juice
Answer:	Dear Valued Customer, We take responsibility for each product sold, and we provide a two-year warranty and lifetime service for the jump starter. Please provide your order number, Then we will record and activate your 24-month warranty.