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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Availability:
In Stock.
Arrives
Sunday, May 17
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Features
- 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
- Monitor Power Levels: Two-color charge status LED light indicates the state of the charge and if the battery voltage drops too far under load, adaptive charging will resume full charger output power. Automatic charge cycle functionality switches to float mode after fully charging the battery
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
Output Voltage: 12 Volts
Input Voltage: 12 Volts
Current Rating: 750 Milliamps
Amperage: 0.75 Amps
Connector Type Used on Cable: Alligator Clips, Ring Terminals
Number of Ports: 1
Item Dimensions D x W x H: 2.9"D x 2.15"W x 4.4"H
Specification Met: CSA, ETL, FCC
Color: Black/Green
Brand: Battery Tender
Mfr Part Number: 021-0123-CA
Global Trade Identification Number: 78
Manufacturer: Deltran
Model Number: 021-0123
External Testing Certification: Não Aplicável
Item Type Name: BATTERY_CHARGER
Warranty Description: Manufacturer Warranty
Built-In Media: Battery Tender 021-0123
Unit Count: 1.00 Count
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, May 17
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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- Financing through Apple Pay
Learn more about financing & leasing here.
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Top Amazon Reviews
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.
Reviewed in the United States on January 1, 2026 by Kolby
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.
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Reviewed in the United States on March 12, 2026 by Joe Black
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.
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Reviewed in the United States on May 6, 2026 by TOGA
I couldn’t be more thrilled with this charger. It’s an absolute lifesaver for anyone who owns motorcycles, ATVs, or other vehicles that require regular battery maintenance. Setting it up is a breeze, even if you’re not particularly tech-savvy. The design is compact and lightweight, making it easy to handle, store, or even take with you on the go. One feature I really appreciate is how it automatically switches to maintenance mode when the battery is fully charged. This gives me peace of mind, knowing my batteries are protected from overcharging, which can cause damage over time. I’ve used it multiple times already, and every single time, it’s performed flawlessly. My motorcycle battery used to struggle during colder months, but with this charger, it stays in top-notch condition and starts up like a dream. I also love how dependable it is—no sudden glitches or errors to worry about. It truly does what it’s supposed to do, and it does it exceptionally well. Honestly, it’s worth every penny and has saved me a lot of headaches. If you’re looking for a trustworthy, efficient, and easy-to-use charger, this is the one! It’s the kind of product that quickly becomes a must-have in your toolkit. I wouldn’t hesitate to recommend it to anyone in need of a reliable solution for battery care.
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Reviewed in the United States on April 9, 2025 by Everyday shopper
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.
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Reviewed in the United States on February 12, 2026 by Otdrsman
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.
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Reviewed in the United States on October 27, 2022 by MeepBeep
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.
Reviewed in the United States on April 9, 2026 by Amazon Customer
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.
Reviewed in the United States on May 6, 2026 by Ken