Battery Charger Automotive Trickle Charger Battery Maintainer, TOPDON T4000 4A/1A for 6V/12V Lead-Acid/Lithium ion Batteries Auto Smart Battery Desulfator with Temperature Compensation AGM Deep Cycle

Made connecting to battery easy

I needed a battery maintainer that will do all types of batteries and revive batteries. I saw a recommendation for this from a non sponsored person and got it. It works great. I do wish it had a voltage screen but it is fine.

Been taking my batteries in to get charged ($7 each time) because they get too low for the Harbor Freight charger to even recognize them. Set up a totally dead battery and within a couple days on repair it was fully charged back up!If you have cars you can't run a trickle charger to and need to frequently recharge batteries, this thing seems to be a great solution.

I bought this battery charger with multiple uses after seeing a YouTuber using this instrument to recharge and use a spent car battery instead of having to spend a fistful of dollars on a new battery. Right now, I’m trying to refurbish a battery after barely using it but knowing the battery was totally dead. I’ll update if the battery is successfully charged.

The charger arrived on time in great condition. Well packaged and easy to get set up. I purchased it for a specific vehicle so I use the provided battery pigtail . Here is where the one star deduction comes in. When you hook up the red to positive black to negative on your battery you end up with an exposed positive post on the plug on the pigtail. The unit needs to be provided with a cap or plug to prevent contact between the exposed terminal and a ground.

Just charged battery in my 2008 Avalanche. It sometimes sits for months so I've had to rely on AAA who usually takes a long time to charge it up. Most cars don't have enough juice to charge the larger truck battery but this awesome little charger does in about an hour. I'm so impressed. Use the mode button for 12 or 6 volt and attach cables. The 12v supply selection super charges. Really wonderful for anyone or any vehicle.

A smart tender with 4 Ampconstant power supply. Perfect for plugging the bike in to keep it topped off. Also turn to power supply to work on it in run mode or listen to the stereo in acc. I have a battery tender cable on the battery so I did need a reverse polarity adapter to use it.

Easy to use, Wish it had a higher amp output. Great for mowers over the winter.