Battery Tender Junior 12V, 750mA Charger and Maintainer: Automatic 12V Powersports for Motorcycle, ATVs, and More - Smarter Than a Trickle Charger - 021-0123

I have had this tender for over 2 years now and of course it works great. The brand is great, it keeps my motorcycle battery alive during the cold season. Easy to use and great value.

HIgh end quality product. Works really well, and saved me from getting stranded because of a dead battery. My OEM battery was about 4 1/2 years old and after using this tender I saw that my battery wasn't holding a charge and was weak. I don't know about others, but trying to start my car and finding out the battery has permanently expired is not a happy experience. I also plan to use it the next time I go on vacation and leave my car in garage. Batteries are always losing their charge, even when there is no drain on them.

I bought this one as a gift so I can't open it. I have the exact same one hooked to my car battery that's in storage. The battery is going on eight years. Considering I would have bought another battery by now, it's already paid for itself. I've never had a problem with it and it works flawlessly, just hook it up and plug it in. This is one battery tender I highly recommend.

We have a '98 Lexus ES300 with a 2.5year-old Toyota battery installed, and this winter the car has been parked outdoors and goes several days without starting (second car). However, on the day one of us needed it, the car failed to turn over as the battery had really run down due to loss of charge. AAA Service tech was called, he did a battery check, found it to be still useable, did a jump start, verified that alternator was putting out required charging voltage, and told us to run the car for at least a half-hour, when the battery should more or less be charged up...which we did, and it was. The service tech also suggested installing a trickle charger, which brings me to this review. After checking all the user reviews on Amazon for both the Battery Tender (BT) Junior and the BT Plus, we opted for the lesser-priced Jr., being aware that many users recommended the BT Plus for automobile battery use over the Jr.. The Jr. arrived about 3 days after our flat-battery incident, and following mfr. instructions, we connected ring adapter to battery, attached the 25ft extension cable, and plugged the unit into one of the interior garage 115V outlets. The indicator light went to solid RED, and stayed that way for between 36-42hrs, when it then went to blinking GREEN, and shortly thereafter to continuous GREEN. Car starter cranks immediately, all systems running, and it certainly looks - without an independent check of battery amperage - that the Jr. did its job, and placed the battery at full charge and switched to "floating' or maintenance mode. Interestingly enough, the user manual states that the "blinking GREEN" condition (at least 80% of full-charge) is seen only for the 1.25A version (BT Plus), but it also was noticed for the Jr.'s status light. After a week, we are totally satisfied with our purchase, as the device works as advertised, easy to install, and seems reliable to date. It should also be noted that all electrical connections are made either indoors or under a (closed and locked) hood, with the extension cable itself being the only part of the charging system exposed to the elements. Will monitor the BT Jr. throughout the winter to check on longer-term reliability issues.

These are the best! I have four of them on my, Polaris Ranger, Polaris Sportsman, John Deer Gator and John Deer mower. They work flawlessly! I never worry about them when they're hooked up. I use them all year round without incident. They are small lightweight and super reliable. They are either charging or maintaining the batteries all the time. The are especially useful in the winter. The cold drains a battery and this little guy keeps them charged. The new version comes with alligator clamps (I don't like) and they say you can use the loop holes on the clamp to connect to the battery terminal. Unfortunately those loop holes are too small to go onto a battery terminal. However you can buy Battery Tender "the quick connect ring terminals" with larger loop holes to attach to your battery terminals. I gave it 4 stars due to the newer product not having large loop holes.

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 glanceThe 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.

Bought two. One for my generator and one for my zero turn. Works excellent and keeps batteries hot and ready to go. Wired both to battery terminals when in use just unplug quick disconnect and go.

This is a VERY easy battery tender to use. Simply plug it in and attach it to your battery. The electronics do all the work. I drive my truck about 2 times per month, and it keeps the battery fresh for every use. Price was good.

Perfeito

Muy bien

Easy to use and works fanastic

What great product i bought depending on its reviews but it just last for 3 seconds and then it blow up … cheap quality

This item is really for the U.S. market and was of no use to me as can not be safety used with uk power system.