[4-Pack] 12V 750mA Trickle Charger for Car Battery, Automatic Smart Battery Maintainer & Float Charger for Motorcycle, Boat, Lawn Mower, Marine SLA AGM Gel Lead Acid Batteries

I love these chargers! But I love tools, so there's that. Used them all last winter. They work fantastic!

These are great little cheap 12v lead acid battery chargers. I use them for charging sealed lead acid batteries like you find in uninterruptable power supplies (1290's and such). They work great as long as the battery is disconnected from the load, bringing them up kindly to full charge and then "floating" or "maintaining" them at charge indefinitely. What doesn't work is if your battery is still connected to any sort of load. My guess is that the 750ma rate is just too slow to keep up with even tiny loads, so any load on the battery constantly pushes the charger back into "charge" mode. So if you want to charge a battery that is still connected to a load, you might look for a stronger charger. These are great for charging batteries "offline". Don't get me wrong, you CAN charge a battery even when it has a small load, but you'll probably see that it is always "charging" and never getting to "maintenance" mode, which may or may not be great for the battery. I'm not sure.

I have 16 or these now and they keep the batteries up to charge over the winter. They work great.

Liked the 4 pack for multiple machines. So far so good. Keeping a couple batteries fresh over winter. Trickle charge is what was needed. Easy to use, clip on and plug in. Perfect.

Work as described. Very easy to use. Nice design and good cord length. Decent price for 4 chargers.

Loved these so much I bought another pack to addd to all my equipment, never worry about a dead battery again and really inexpensive

I use this to charge my kid's Powerwheels battery because the charger that came with the toy is trash. So this primarily charges a small 12v sealed battery. The dummy lights help me understand whether it's charging the battery or when the battery is full. There's also a light to let me know I've got my +/- terminals mixed up. And once the battery is fully trickle charged, this will maintain the battery. A great function since I often forget to come back to the garage and unplug the charger... and that's what probably destroyed my kid's prior Powerwheels battery because I'd forget and let it run for days before unplugging it. Now with this smart charger, I don't have to worry about overcharging the battery and shortening its life. As an added bonus, this is great for actually maintaining my lawn mower battery over the winter when it's not busy charging up my kid's Powerwheel. The whole charging assembly is light, with long enough cords, and has so far functioned without a hiccup. Very reliable.

I put my Mustang up for the winter. The battery didn't hold a charge last time--it's getting old, so I thought I'd buy a battery maintainer. I wanted low current and ONLY 12V just in case the AC power hiccupped and the unit reset. I didn't want to worry about it doing something "bad" and harming my car battery. I also wanted no de-sulfation (some info on the web says it could damage a battery). This met all criteria. I attached it to the battery. No sparks, which is good (a different vendor's charger sparks when I do that). No lights are on, which is good (the other vendor's charger indicated it was charging!). When I plugged it into an AC outlet, it indicated it was charging. I monitored the voltage at the battery terminals and it slowly when up as it charged the battery. Battery voltage was at 14.28V when it was charged. I like this one better than the other one I bought for my SUV so either I will use it for both vehicles, or buy another one (price is right).

I have a bunch of these for various pieces of equipment. Work perfectly

Needed a charger for my 12v Generator Battery. Not only was this price great, but the charger worked perfectly to Charge up my new Battery for its first use. Can't say anything bad about this, works as described.

works well for a great price. It's all you will need

Bought 2 to maintain batteries on generators in a remote area. Work as described.

I use it for trickle charge my many vehicles—over winter especially