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 used Battery Tender chargers for many years, mostly on motorcycle batteries, with good results: quick starts, longer battery life, less maintenance. I have two lawn tractors now (a Sears 48" conventional type mower, and a commercial grade Exmark Lazer ZTR) that live in the garage, and normally aren't run much for the three-ish months of late fall-winter in Texas. If you live in colder climates, this charger is even more critical. Hooking it up is a breeze. If you can take a nut off a bolt, you know all you need to know to install the harness. Remove the positive (red) battery cable (this is a good time to clean up the cable end and battery terminal with a small wire brush). The Battery Tender cable has a loop type butt connector on it, so just slip the red harness cable end over the battery bolt, put the positive cable and nut back on and you're halfway home. Repeat on the negative (black) cable. That's it for the harness hookup. Simple, right? Tie wrap the harness in a convenient place where you can get to the connector end, as the harness stays with the battery full time. Kudos to the manufacturer for putting a cover on the connector end to keep it clean. The original Battery Tenders didn't have that! The connector to the charger is a flat two-conductor end that can only be connected one way, so no screw ups there. Even if you manage to do it wrong (wiring the harness backwards on the battery, for instance), it won't hurt the charger, it just won't charge. Connect the harness and charger together, and plug the charger in. There is a light that reflects charging state, and also lets you know if the battery is too dead to charge this way or if the harness is wired wrong. Once it gets back to steady green, you are charged. Now it will turn on and off as needed to keep your battery at optimal levels until next use. This maintenance charge also limits buildup of sulfates in the battery, the main reason unused batteries short out. Yes, it does cost about the price of a lawn tractor battery. In my experience, it doubles the life of the battery and lasts for years so it will pay for itself. But the real value is never coming out of the house ready to go and have a dead battery stop you in your tracks... waiting hours for the charger to get it back into shape, then seeing it not hold a charge because it is sulfated. I do not miss that frustration, and this is a pittance cost-wise to avoid it. A good product from a company that has been making them for long enough to know how. They also make bigger ones for larger batteries. I have owned both types, and they work similarly. It isn't fancy, and won't wow your friends, but it does exactly what it's supposed to do. I like that in a product.

This little gem is worth it's weight in gold for anyone with a motorcycle or scooter. I use this tender for my honda metro. It has the option to use the clamps or the bolt on rings (interchangable). And, the very best part, it has a connector on the wiring so that you can keep the rings bolted on your battery and have your tender disconnected. This way, all you have to do to 'recharge' or boost your battery's charge is connect the two sections of the cord together, plug the tender in and VIOLA! your battery is being boosted without the hassle of removing battery covers, bolts, straps, etc. So easy to understand and use that a kid or a senior can do it the very first try! I highly recommend the purchase of this product for ANYone who owns a vehicle that they don't drive/start on a regular basis. My Metro has a tendency to have a drained battery if I don't start it at least once a month. For this reason, I purchased this tender and keep it plugged in when parked in my garage using the bolt on rings and taking advantage of the wire disconnect option. Although this is probably a bit overkill on charging, I honestly love having a fully charged battery when using my Metro (since my commute to work is 37 miles one way). This tender will NOT overcharge your battery and is perfectly fine to be used for extended periods. I would suggest it be used in an inside environment, although I'm not sure it states this on the product. I know I've been a bit detailed in this review, but I cannot say enough how much this is a time saver and life saver for anyone with a part-time vehicle (or, like me, a vehicle with a fickle battery). You will not be disappointed in this tender. Oh, and it has a LED light indicator with full explaination on the top so that you know when your tender is charging, your battery is fully charged, or if there is a connection/charge problem. The unit gets a bit warm, if you leave it plugged in for an extended time, but not hot enough to damage anything.

Great product, great company. Used the warranty and they honor their word. The new one came fast. The only battery maintainer I'll use from now on.

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.

I have a couple of these as the Battery Plus Tenders are twice as expensive . This works well on my cars with good batteries ( No kidding 8 years old but always hooked up when not driving so they last ) . The downside is reading the trouble light if your not used to it and know only how the others work . The only other deficiency is it does not charge as fast if the battery is low to bring it up to the maintenance circuit . I think its around .75 amps instead of around 1.25 you can read at their site what the factual numbers are but thats about it . Still brought up my total loss deep cell battery eventually maybe 2 days instead of 1 for the others that I use in my campers when it was low from running the tv and lights with the engine off . I am older , severely disabled and drive only about 2k miles a year with 3 vehicles , a motrocycle , boat , camper etc . Since I have used these I have paid for them in battery savings and they last fairly well . The warranty isnt that good as you pay shipping bit I used it once it was better on the expensive ones that just letting it go . I always use the quick disonect and have the extensions for vehicles i park in the drive at times . I have had 2 of these 2 single tender pluses and a 4 bank . The oldest about 6 years old . Only problem I had was end plugs rusting when outside . I figured it would throw the circuitry off if I repaired it ...but it didnt . They all still work . Very pleased . It is a investment but living up North with freezing temps that will freeze a battery that gets a low charge seperating the plates and destroying it these are great . Plus if you plug in nightly the draw from the new digital equipment doesnt lower the charge which will cause more sulfation as you charge up from a deeper discharge . Like I said where I used to get 3 years or even less if I didnt drive a car for a few months for the life of a battery I have two in cars now 8 years old . I think they pay for themselves . With the quick disconect it is so easy . I just put a something on my hood in front of the drivers windsheild or on it to remind myself to disconect each time I drive . These are way ahead of the Harbor Freight ones that do not have the abillity to charge a battery up just trickle charge it and cut off at 13.8 volts . You will not be sorry . I had one car stored for 6 years , never started though we put stabil in it fresh yearly and it started right up and ran fine and improved after fresh gas was put in with sea foam another good product but a tad expensive . Star Brite or Star Tron is almost as good , stablizes gas and is very cheap if you use the Diesel one when it is on sale . God Bless . :-)

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.

Got this on my mechanic’s recommendation when my 1-yr old battery died after our having accidentally leaving the headlights on for an hour. Though the auto parts store tech tested it under load and declared it good, my mechanic was skeptical. He told me he used Battery Tender on all his vehicles which are stored outside and he hasn’t bought a battery in years. Good enough for me. I typically buy a new battery every 3 years for about $150. Ditto for our lawn tractor. The pickup’s battery is 8 years old—a miracle. All of our vehicles suffer from the same problem which we cannot resolve because we don’t drive much: too many stop and go trips to allow the alternator to ever fully charge the battery. So, if we could buy some Battery Tenders for $25/vehicle and maybe never have to buy another battery, that would work for us. I bought 4: one for each of the above vehicles and one for our marine battery. What I Like: 1. It saved my car battery. When I first plugged it in, it stayed red for about 12 hours meaning the battery was under 80% charged even though I had driven 40 miles on interstates since getting a jump. It did go solid green meaning the battery was fully charged. 2. It is easy to install. It comes with two options for connecting the tender to your vehicle’s battery: alligator clips and round connectors. The former are great for temporary connections and the latter preferable for permanent ones. All of ours are connected via the round connectors. See the first photo for a picture of how it is connected to our truck. The second shows the tender plugged into the outlet. 3. Once your battery is fully charged and the light on the tender is solid green, it continuously monitors your battery and trickle charges it to maintain it at 100-103%. 4. With our kind of driving where we don’t drive 30+ miles before stopping and turning off the engine, when we come home and plug in we are solid red, but in less than 10 minutes we are solid green. This tells me the tender is indeed keeping our batteries fully charged, something our alternators can’t do because we don’t drive enough before turning off the engine. What I Don’t Like: 1. The chart showing you which Battery Tender is right for you says “trucks” need a much beefier model. I consulted our mechanic and he told me that “trucks” really refers to big trucks, that is, not a pickup or anything you’d find in someone’s driveway. I was very grateful for his advice, but was unhappy with Battery Tender’s guidance. Bottom Line: This is a great product and may keep you from ever having to buy another battery for your vehicles. It is easy to install. If you have a pickup, just buy the Junior Tender. Yours is not a truck as viewed by the manufacturer.

Works great and it's compact.

Perfeito

Very bad, damaged first 1minute of use due to voltage, 220v is our voltage while device is 110v!!!!!!!!!

Great product. It's small, well thought-out and does what it says on the box. I travel a lot for work, so my car is parked at home for 2-3 weeks every month. I drive a BMW, and the electronics draw the battery down while it's parked. It will start after 2 weeks but not after 3 if no one runs the engine. So I picked up a battery tender junior and I've been very happy with it. It's small enough to tuck in the trunk, and the detachable leads are a great feature - I leave them attached to my car's jumping posts under the hood, so it takes all of a few seconds to connect or disconnect. It's kept my battery in great shape. In fact I've gained a few tenths of a volt both with and without the engine running, which is pretty fantastic considering my battery is 4 years old. I run a couple aftermarket amps, an obd2 wifi dongle, and a radar detector, which I know is taxing on my car's electrical device, so this guy gives me some peace of mind. And it's a steal for the price... it's a half to a third the price of a decent trickle charger, and it's better for my battery which is going to save me money over time. Very happy with this purchase.

dopo un mese non funzionava già più.

Excelente producto, yo le puse un conector rápido a la batería para solamente abrir el asiento y conectarl, sin necesidad del adaptador, carga perfecto la batería y de lo más rápido posible.