Best Automatic Battery Charger 12v

1.Battery Tender 12 Volt Junior Automatic Battery Charger


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.


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.


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.


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.


Our 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.

I have four of these for various batteries. Have you seen battery prices lately? It's worth keeping them safe. So far this brand has worked well for me.


I can't add much to what has already been said, except I'd like to clear up some confusion about people's expectations of what voltage this will output: I put a heavy load on a car battery for a few minutes and then used a logging multimeter to monitor the voltage output from the Battery Tender Jr. as it charged it back up over the course of 90 minutes. Look at the attached graph... As you can see, the voltage output is not simple, and just checking the voltage once will not tell you the whole picture. I have color coded the various phases (solid red, blinking green, solid green) for clarity.



2.NOCO GENIUS1, 1-Amp Fully-Automatic Smart Charger



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.


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.


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.


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.


Automatically detects battery sulfation and acid stratification to restore lost battery performance for stronger engine starts and extended battery life.


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.


Charge and maintain cars, motorcycles, lawnmowers, ATVs, tractors, trucks, SUVs, boats, classic cars, hot rods, and more.

I received it very quick and put it to use right away. Charged my 12v wet cell battery great. Took a little while due to battery was very drained. It charged all the way to 75% and then started to do the maintenance charge which im sure took a while. I went to bed and woke the next morning to find the status led was solid green. So far this little charger is great. One thing i would strongly recommend is to take a pic or dont loose your owners manual. This show what the status of the led and what it doing. It also show how to select different batteries or get into different modes. Since this model is so new, i cant find the owners manual anywhere online. (yes, I lost the manual) Other then my failure to keep the manual, product work great and does exactly what it designed to do. I currently have it working on my 6v 240ah battery and it seems to be doing great.



3.Adakiit 6/12V 4A Smart Battery Charger/Maintainer



Remove vulcanization (desulfation), repair slightly damaged battery. Pulse Maintenance extends battery life.


Intelligent 9-stage charging: Diagnosis - Desulfation - SoftStart - Bulk - Absorption - Float - Analysis -Recondition - Pulse. Intelligent MCU controller unit, automatically stop output when fully charged. Unique winter mode for better charging effect in winter.


Suit for 6V or 12V Batteries - AGM, SLA, GEL, WET, VRLA, LFP, etc. - Scooter, ATV, Jet Ski, Snowmobile, Motorcycle, Lawn Mower, Car, SUV, RV, Pickup, Tractor, Boat, etc.


The LCD Screen provides you status of the charging directly with big and clear fonts . You can read the real-time charging current and voltageas well as diagnostic information. And its backlight feature makes it easy to read in darker places.

I ordered after extensive reviews.. this was mainly purchased to charge up a pair of 6 Volt Motorhome Batteries that were left on for 2 months...therefore their voltage was really.. I was reading 5.1 on both 6 volt batteries (Duracell Pro) I used this charger in 6 Volt mode and let it charge for about 48 hours... each er battery.. I would move the Connectors around a couple time just to make sure the connection was good.. Each battery now is at 6.8 Volts!! nearly 7 Volts!! a full 1.7 volts slowly trickled.. If there was one thing to say negatively would maybe be the Clamps could be a bit more heavy Duty.. But they are no means flimsy or cheap.. I plan on doing the charging the 12 Volt battery in the Engine Compartment of the Motorhome Now..


The beauty is how small the unit it.. and if you do over-charge it will shut off and not damage anything... Also a big + is the LCD readout so you can see the progress of the charging happening. Many other chargers do NOT have this LCD.



4.Schumacher SC1393 6/12V


Provides 12A to charge and 3A to maintain your battery. Microprocessor-controlled, with multi-stage charging for added precision, safety, and battery life. Auto voltage detection automatically detects 6 or 12V batteries. Reverse hook-up protection ensures charger will not operate if clamps are reversed. Includes LED indicators and push button controls for ease of use.


The bottom line, in my view, is that this Schumacher SC1279 12V Fully Automatic Battery Charger and 8A Maintainer is a great deal. I definitely got my money’s worth even from just one use. It did take longer to charge my dead car battery than I expected – about 20 hours to fully recharge the fully-discharged battery. However, the estimated 3.5 to 8.5 hour charging times listed in the user’s manual are based on a 50% discharged battery, while mine was probably close to 100% discharged.


I bought this unit to charge the fully-discharged car battery in my son’s 2011 Suzuki. He’s out of state, and I’d been driving his car once a week, for about 30 minutes each trip, to keep the battery charged. One cold winter morning I went to drive it, and the engine wouldn’t turn over. A towing service came out to jump-start the battery, but the mechanic warned me that it was almost fully discharged, and that while it could be jump-started, it wouldn’t recharge unless I drove the car nearly continually for several hours, or used an electric charger to recharge the battery. He was able to jump the battery, and I drove the car for about an hour. The next time I went to start it, a week later, it started up promptly and I drove it for a half-hour, but a week after that, the engine wouldn’t turn over at all; even the dashboard lights wouldn’t turn on. That’s when I took the mechanic’s advice and bought this charger.


Having never used a charger like this one before, I carefully read the instructions, which were printed in both English and Spanish, and found them clear and straightforward. They included directions both on how to charge a battery still connected in the automobile and on how to charge a battery removed from the vehicle. I was relieved that I wouldn’t have to disconnect and remove the battery from the car to use the charging unit. I was also happy to discover that the power cord, from the charging unit to the 2-pronged plug that plugs into the wall socket, is 80” (6 feet 8 inches), and the charging cable is 89” (7 feet 5 inches). The long lengths meant there was no need for an extension cord, which the instructions caution should not be used unless absolutely necessary.


Following the instructions, I connected the black / negative clip to the car chassis (NOT the negative terminal on the battery) and the red / positive clip to the positive terminal. I then plugged in the charging unit and turned it on. The yellow charging light on the unit indicated that the battery was charging.


After two hours, the yellow charging light still indicated that the battery was charging, but I wanted to see if the battery had recharged enough to start the car. I turned off the unit, disconnected it from the outlet, removed the charging cables, and tried to start the car. The engine still wouldn’t turn over, and the dashboard lights still wouldn’t go on. I reconnected everything and then, after another seven hours, with the yellow charging light still showing that the battery was charging, disconnected everything and again tried to start the car. Again, I got no power from the battery, and began to worry that the unit wasn’t working, as I was still not getting even a little juice from the battery after nine hours of charging. I reconnected everything, crossed my fingers, and left it to charge overnight.


In the morning, after about 20 hours of charging, the yellow charging light had gone off and the green charged/maintaining light was lit. Sure enough, after I disconnected everything and started the car, it turned over instantly.


I am not planning to use the maintaining function, which allows you to leave the unit on and connected to the battery to keep it from draining after it has been fully charged, so I can’t speak to that function, but I am delighted that for the low price, I was able to fully recharge a totally dead car battery in less than 24 hours. That was longer than I expected it to take, as the manual indicates that with the 8A charging unit, a 50% discharged battery should be fully recharged within 3.5 to 8.5 hours, depending on the battery’s CCA (Cold Cranking Amps) rating – but as the car battery I was charging was around 100% discharged, not just 50%, it’s not surprising that it took significantly longer to fully recharge.


5.LST Trickle Battery Charger Automatic Maintainer



Charge fully drained 6V&12V pb/sla/gel/agm/lead-acid batteries, it's automatic battery trickle chargers for automotive, motorcycles, automobile, riding lawn mowers, lawn tractor, ATVs, RVs, watercraft, powersport, scooter, snowmobiles, cars, camper, trolling motor, boats, etc.


Featured detachable ring or alligator connectors with 10A fuse, charge and maintain your battery wherever you go; 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 - LST 6/12 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 motorcycle charger everywhere.



This is a small unit, about the size of your palm. It is really meant for maintaining the charge on a battery that sits unused over time (draining all the way down is very bad for lead acid batteries). The unit has a logic circuit that first detects whether your battery is significantly depleted and needs to actually be charged, or if it has a sufficient charge but just needs to be maintained. Once it fills the battery, it switches over to the maintenance function. It has selections for 12v or 6 v, with 12v being the default.


Note that due to the logic circuit this cannot be used to set up an electrolysis tank; it will not detect the battery and will not activate.


The quality is good overall. I'm using it on my boat batteries and on a car I don't currently drive.






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