Battery Tender® Junior 12V, 750mA Battery Charger

SKU: 021-0123

Charges and Maintains:


The Battery Tender® Junior 12V, 750mA Battery Charger and Maintainer is all you need to stay charged, extend your vehicle's battery life. It's easy to use, safe and secure. 

Boost your ride’s battery life with the Battery Tender® Junior Automatic Battery Charger and Maintainer by Deltran for motorcycles, ATVs, and more! Unlike typical trickle chargers that can overcharge a battery and cause damage when connected for too long, our advanced charger and maintainer provide a full charge before switching to float mode to keep your battery at an optimal charge. Designed for use with powersports, it can even assist with automotive vehicles!

There’s no need to work harder when you can let our smart battery charger and maintainer do the work for you! With reversed hook-up protection and the Quick Disconnect Harness, you can connect and disconnect the charger in seconds. The lightweight charger comes with a 12-foot output cord, fused alligator clips, and a fused ring terminal harness for hard to reach spaces.

The Battery Tender® Junior is an automatic battery charger, equipped with a Smart Microcontroller that functions as its “brain” to ensure the proper level of power is sent to the battery at all times. Coupled with its ISM adaptive charging, our charger and maintainer improves the battery life of batteries commonly used in motorcycles, ATVs, personal water-crafts, lawnmowers, and more. 

You can finally stop guessing if your battery is at a full charge thanks to the charger and maintainer’s LED indicator. Flashing red indicates the battery is not charging, while a solid red light lets you know that the battery is charging. When the light is flashing green, your battery is at least 80% charged and a solid green light informs you that your battery is maintaining an optimal charge. 

Connect and forget with the Battery Tender® Junior! Capable of managing battery health all on its own, this charger and maintainer is equipped with reversed hook-up protection that checks for a correct connection before providing power to remain spark free.


- Fused ring terminal accessory cable for hard to reach batteries 

- Fused alligator clip accessory cable for an alternate connection 

- Quick Disconnect Harness so you can leave your connection attached to the battery to easily reconnect and charge 

- 12 foot output cord for maximum reach 

- LED status indicating light to show when the battery is being charged and when it’s ready to go 

- 5 year warranty 


- 12 Volts (V) 

- 750 Milliamps (mA) 

- Compatible with lead acid, AGM, and gel batteries

- Optimal for charging and maintaining powersport vehicles like dirt bikes, motorcycles, jet skis, lawnmowers, ATVs, UTVs and more 


Smart charger technology assures the correct level of power is sent to the battery at all times.

1. Initialization determines if the battery is connected correctly and battery’s charge level, composition 

2. Bulk Charge brings the charge up with full charge and constant current 

3. Absorption Mode slows the charging down until the battery reaches full charge

4. Float/Maintenance Mode keeps the battery charged without overcharging or discharging 


Battery Tender® battery chargers and maintainers are manufactured with built-in safety features like: 

- Spark proof included connections (ring terminals and alligator clips) will not spark when touched together, the charger will not produce output voltage until it senses at least 3 volts from the battery 

- Reverse polarity protection that ensures the charger will not charge unless the connections are attached to the correct polarity 

- A safety timer that will shut off the charger after 80 hours of continuous use 

Our robust Battery Tender® Junior battery charger and maintainer meets agency approvals and safety standards from UL, CSA, BC, and FCC. 

California Residents WARNING: Cancer and Reproductive Harm - 


Battery Tender® offers a Limited Five-Year Warranty for the Battery Tender® Junior. Please reference the Warranty FAQ Page for detailed warranty requirements. 

Note to purchasers of Battery Tender® Chargers Models 022-0192 (Junior Version 1), 021-0123 (Junior Version 2), and 022-0185G (Plus Version 2) between February 2013 and February 2017: 

The product informational materials supplied with these models contain a misprint that incorrectly lists that the chargers can charge 200Ah batteries. The actual maximum and minimum battery sizes these products can charge and comply with energy efficiency requirements are as follows: 

- Battery Tender® Junior Version 1 (PN 022-0192): 55Ah maximum battery size, 4Ah minimum battery size 

- Battery Tender® Junior Version 2 (PN 021-0123): 55Ah maximum battery size, 4Ah minimum battery size 

- Battery Tender® Plus Version 2 (PN 022-0185G): 79Ah maximum battery size, 6Ah minimum battery size