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Battery Tender

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

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Condition: New
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$39.97
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Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Oct 28
Order within 13 hours and 32 minutes

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At a glance

Condition
New
Size
12V @ 750mA
Model
021-0123
Dimensions
2.9"D x 2.15"W x 4.4"H
Color
Black/Green
Output Voltage
12 volts
Specification Met
CSA, ETL, FCC
Warranty
Manufacturer Warranty

Features 5

  • Stay Charged: Battery Tender battery chargers and maintainers provide a full charge to your powersport vehicles battery before switching to float mode to maintain proper voltage levels for safe, long-term storage
  • Extend Battery Life: Compatible with all 12V lead-acid, flooded, AGM, and gel cell batteries. Complete 4-step charging program (Initialization, Bulk Charge, Absorption Mode, Float Mode) allows for optimization of battery power, without overcharging or battery damage. Smarter than a trickle charger.
  • Includes: 12V, 750mA battery charger and battery maintainer with 12-foot output cord, fused-ring terminal harness for hard-to-reach batteries and alligator clip accessory cables, 5-year warranty, and lifetime customer support
  • Simple & Safe: Low maintenance, easy-to-use, universal battery charger is just 3.3 x 1.3 x 2.4 inches, 1 lb (charger only). Spark-proof circuitry ensures no-spark connections, and automatic reversed hook-up detection verifies correct connection

Description

Junior 750mA Junior 800mA Waterproof Junior 1 AMP Lithium Plus 1.25 AMP Can I leave this connected to my motorcycle all winter without damaging the battery? Yes! Battery Tender Junior switches to float/maintenance mode at full charge, offsetting self-discharge to keep at 100% without overcharging or damage. Unlike trickle chargers, it adjusts output to battery needs for safe long-term storage. What size batteries can this charge? Is it good for small motorcycle batteries? Battery Tender Junior 750mA is ideal for 3–30Ah batteries in motorcycles, ATVs, UTVs, scooters, PWCs, and snowmobiles. Safely charges small 3–5Ah batteries overnight and larger 14–20Ah motorcycle batteries in ~14–22 hrs. Will the Battery Tender Junior work on my Harley-Davidson? Yes, Battery Tender Junior works with all Harley-Davidson 12V models, including Sportster, Softail, Dyna, Touring, CVO, and Pan America. The 750mA output is ideal for Harley batteries, and the included harness allows easy plug-in charging. What is the difference between this and a trickle charger? A trickle charger delivers constant current and can overcharge a battery during storage. The Battery Tender Junior is a smart charger that automatically switches to float mode, charging only when needed for safe long-term maintenance. Will this charge a completely dead battery? Battery Tender Junior can recover most deeply discharged batteries using low-voltage recovery during startup. Batteries below 2V or left discharged too long may be permanently damaged. Red LED = charging; flashing red may indicate a bad battery. Battery Chargers, Jump Starters, Solar Chargers, EV Chargers, and Battery Maintenance Accessories

Specs 20

Brand Battery Tender
Color Black/Green
Product Dimensions 2.9"D x 2.15"W x 4.4"H
Output Voltage 12 volts
Specification Met CSA, ETL, FCC
Input Voltage 12 volts
Current Rating 750 milliamps
Amperage 0.75 A

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Oct 28

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

Does what it is supposed to do
Size: 12V @ 750mA
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. ... show more
Reviewed in the United States on December 19, 2010 by Rick Park
Excellent battery maintainer
Size: 12V @ 750mA
Review Image by TOGA
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. ... show more
Reviewed in the United States on May 6, 2026 by TOGA
Best brand and most reliable battery tender you can buy.
Size: 12V @ 750mA
Very best battery tender on the market and don't be fooled by the other brands.I leave mine hooked to my motorcycle continuous and they really extend the life of any motorcycle or atv battery
Reviewed in the United States on October 9, 2026 by Bob S.
Easiest Battery Tender to use!
Size: 12V @ 750mA
This battery charger is so easy to use. I purchased another brand last December and it lasted only until September of this year. I thought it may have been a lemon so I purchased another one this year and it lasted about a week. So I tried this one and it is universal so no modes to choose and no messing around. Plugged it in and it started charging within the hour. So happy with it keeping our car that is not in use ready to roll as soon as we need it. ... show more
Reviewed in the United States on October 3, 2026 by Amazon Customer
These are a must have for those that dont drive their cars much , or have batteried equipment that is stored periodically .
Size: 12V @ 750mA
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 . :-) ... show more
Reviewed in the United States on November 21, 2016 by Croppled1
Works great indoors in attached garage
Size: 12V @ 750mA
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. ... show more
Reviewed in the United States on October 27, 2022 by MeepBeep
Easy to use
Size: 12V @ 750mA
Very nice battery tender. Nice features and super easy to use.
Reviewed in the United States on October 13, 2026 by Keith Conaughty
Great company
Size: 12V @ 750mA
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.
Reviewed in the United States on September 11, 2026 by Amazon Customer
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