Battery Tender Battery Charger 12V, 750mA – 021-0123

Works perfectly, small in size, worth every penny.

Bought a new battery for my motorcycle a year ago. Left it in storage over the winter and the battery went dead, impossible to bring it back to life. Bought a second battery thinking the first one was defective. Left it packed for two months and again went dead. Bought a Battery tender and installed it and plugged it in every time I leave it for a while. Now been a year and the battery is in great shape. Like having a bodyguard near you battery to keep it warm and ready… now have been impressed and a true beleiver in Battery Tender… Great product… Really..!!

I bought a BT Junior to keep my Honda generator ready to go and it’s working perfectly. Small, simple, and safe! I like that it’s specifically safe for long-term storage, and it’s keeping my battery topped up and ready at all times. It’s solid and compact, and I’d definitely recommend.

I’m a greenhorn at car-care, but this product was pretty much foolproof! I’m using it to keep the battery topped off for my family member’s car, as she has just had surgery and won’t be driving for 2 months. I do not need it for months and months of storage and maintenance, so the 2018-era reviews complaining about “now it only lasts for one year” after the manufacturer’s move to China, really don’t matter to me!

I really appreciate the built-in safety feature of no sparking if you touch the clips together. Current won’t flow through this product, even when connected to the outlet, until it senses 3 volts. This could make it hard to charge a TOTALLY dead battery with this product, but it worked perfectly for us.

To put this thing together, you’ll have to pick either small-ring connectors – which are for the non-car uses that will sit for over 6 months, like an ATV or motorcycle or boat – or the alligator clips, which are for cars and bigger engines that will be connected for just a few months. You’ll also have to have color vision to discern between red and black, since the alligator clips confusingly have a (+) symbol on one side of their jaws. On the second jaw, they differ (+) and (-), so if you can’t tell them apart at first glance

The most difficult part for me was step 6e/f in the instruction manual – determine if your car engine has negative-ground or positive-ground status. Like I said, I’m a greenhorn here. Sure, the manual says “most cars” are negative-grounded, but I didn’t want to mess it up, cuz car batteries are big hefty things you don’t play around with. After real careful inspection, I found that the battery of our car had a wire going directly onto and behind the hefty metal of the vehicle body or “chassis” I learned it is called, which came from the (-) side of the battery. The (+) side had a complicated plastic cover over it, which made connecting the alligator clip a bit difficult, and that side’s wire led to other engine parts. That’s what made me 90% sure that the negative side was the “grounded” side. So I connected the (-) black clip to the (-) side of the battery, and the red clip to a nut-and-bolt part of the engine. I was able to close the hood on the car most of the way by turning the clips sideways and flat as I could. It’s not latched at the moment, but sitting in our garage, it should be plenty protected from spiderwebs and dust and whatnot. No option in our case to thread the cable thru the front grille since it’s pretty jam-packed with engine parts right behind it.

My one complaint about this product is that the cable ending in the two alligator clips splits pretty close to the jaws end, and it would help to have it split further up, to help users reach a part of their engine block or chassis more easily. Also, I highly recommend addition of diagrams. There are words saying “connect wire to engine block or vehicle chassis, not sheet metal or fluid lines” but some of us need an illustration of what is a sheet-metal body part vs the vehicle chassis!

Once connected to the engine, I turned my back on it just in case, to plug in the “wall wart” (credit to Mythbuster Adam Savage for that term) and the light turned steady red! This was encouraging, since when I had tested it earlier by plugging it into the wall with no connections made, it blinked red. So I was confident I did not have a defective wall wart box.

6 hours later, the light had turned blinking green, and 6 hours after that, it had turned steady green, which the manual says is the perfect state to leave it in for ‘drip feed’ of electricity to keep the battery operable while not in use. So I am perfectly satisfied!

Our car’s battery was diagnosed by a mechanic as “being on its last legs” anyway, so this comparatively cheap product, for 2 months of use only, is perfect for our needs. I’d recommend anyone with a really expensive car or battery that needs storage for 6 months or more do a bit more research and spend a bit more on it.

I use this to charge my car in the garage over the winter. This is important for those long cold winters in the garage where temperatures can get below zero Fahrenheit. Cheap way to keep your car and battery healthy. Keeps the battery charged and healthy in the off season. The long cord and quick disconnects are nice. I just put the one end on my battery in the care and leave it. Hang the quick connect out of the front and connect my car to the charger. I like that it has a really long cord and also the brick is on the wall. Does what it should well. Keeps my car charged over winter. A set it and forget it product.

Comprei esse modelo para manter a bateria da minha moto.
Esse modelo é 110v(não percebi essa informação no anúncio) e eu precisei comprar um transformador(mais fácil que devolver o equipamento) de 220v para 110v. Mas tirando esse detalhe deu tudo certo.

The Battery Tender Jr is working well with my 2024 Polaris 570 Sportsman Touring ATV. The Battery Tender Jr has a built in plug that conveniently plugs directly into the battery charger receptacle in the wheel well or front light pod of a Polaris ATV. As designed, I keep the Battery Tender Jr plugged into my ATV and the wall outlet to keep my battery properly charged. Colored LED lights indicate the charge condition of the ATV battery. It is easy to setup, connect, and use. Buy with confidence.