Battery Tender800mA 12V Weather Resistant Battery Charger and Maintainer - Marine and Automotive Smart Fully Automatic for Boats Watercraft - Selectable Lead Acid Lithium - 022-0150-DL-WH

I bought this back in 2018. It sits outside in the weather does its job and never complains. It has been a lifesaver. I use it for my truck which doesn't get run a lot. Just remember this is not a charger for a dead battery this keeps a good battery happy and ready to roll.

WORKS GREAT, MAINTAINS BATTERY LIKE IT DESCRIBES IT WILL

So, let me tell you about the Battery Tender Junior 800 – it's a total game-changer for my motorcycle battery. This thing is built like an absolute tank, and I'm not even exaggerating. I mean, it's like they took the term "solid construction" to a whole new level.When I hooked up this charger to my bike's battery, it kept the voltage steady at 13.3. You know, that sweet spot you get when your bike is just chilling, idling away. It's like the Battery Tender Junior 800 knows exactly what your battery needs and delivers it with style.What's cool is how easy it is to use, and the size is just right. No fuss, no complicated setup – just plug it in, and you're good to go. I love how it effortlessly fits into my routine, making sure my battery stays in top-notch shape without me breaking a sweat.Long story short, if you're on the lookout for a charger that's tough as nails, keeps things on the down-low with your battery, and just makes life easier, the Battery Tender Junior 800 is where it's at. It's become my go-to for keeping my motorcycle running smooth and steady.

This works great on keeping pack rats out of my engine wires!

I got this to maintain the battery on my C63 Mercedes which I (unfortunately) am currently unable to drive and which is just idling under the covered parking next to the house, for months at a time. I connected it directly to "jump start" terminals under the hood (the actual battery is in the trunk under the mat - not a very convenient area to access), plugged it into wall outlet on the exterior of our house (the 220V "utility" outlet - this device supports it), routed the cable, closed the hood. The indicator light was glowing "yellow" (meaning it was charging) and then turned solid "green" after a few hours (the charging current of this particular model is small so the process is pretty slow), and I just left it connected after that.Overall I am very satisfied with this unit - it is pretty compact, very inexpensive (especially compared to ridiculously overpriced Mercedes-rebadged CTEK chargers/maintainers), waterproof (I already tested, we had thunderstorm a couple of days ago), fully automatic unit with a good warranty. The only couple of minor drawbacks I can see are that the included cable (the one with alligator clips) is a little bit short (though there's an extension available for extra money, which I already purchased) and that there's no carrying case included. But these are pretty subjective drawbacks and I still highly recommend this unit if you are looking for a truly universal (except for maintaining Li-based batteries), durable battery maintainer. And if you need a unit with higher charging current for faster charging - there are also plenty of these available from same manufacturer.

I have two of these. One for my motorhome that sits idle for the inter and one for my car that is only driven occasionally. They maintain the batteries so they don't go dead from parasitic draw. NOw I don't have to jump start these vehicles.

I bought this little battery charger/maintainer for my 50 year old Porsche 914. It's perfect charger for the application. It can mount of the wall and plug in or clip on to the battery terminals easily. It stays out of the way when its not in use and keeps the battery in tip-top shape when the car isn't driven regularly.

I've been using this for several months. It does its job on my convertible.