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Battery Tender 021-0123 Junior 12V Battery Charger

  • Solid State Two Color LED Indicator
  • 5 Year Warranty
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The Battery Tender® Junior is much more than a trickle charger. It has a brain. It's lightweight, compact, and fully automatic; very easy to use, especially in small spaces. It will keep your battery fully charged so that it is ready to go when you are! It has a microprocessor controlled fully automatic charger and maintainer and is designed to extend the life of any lead acid battery commonly used in automobiles, motorcycles, ATVs, personal watercraft, RVs, boats, airplanes, golf carts, back-up generator systems, etc. Any vehicle or battery-operated piece of equipment not used on a daily or regular basis is a candidate for a Battery Tender charger. The advanced technology will bring the battery back to a full charge without overcharging and then float or maintain the battery for an indefinite period of time. The Battery Tender Junior comes equipped with alligator clips and ring terminals for easy hook up.

  • Perfect for all lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell).

  • Complete 4-step charging program (Initialization, Bulk Charge, Absorption Mode, Float Mode).

  • Automatically switches to float / maintenance voltage after fully charging the battery.

  • If the battery voltage drops too far under load, full charger output power resumes.

  • Solid state two color LED indicates stage of charger.

  • Spark proof.

  • Reverse polarity protected.

  • 12' output cord.

  • 5 year warranty

Learn more about the Battery Tender 021-0123


Battery Tender


Alternators & Charging Systems


12 V
Vehicle Type
Any except automotive

Quick Info

Customer Reviews of the Battery Tender 021-0123

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  • brian d.
  • 7/4/2014 3:57:41 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat for intended purpose

Pros: Simple, easy to use. Comes with all of the same connectors as its bigger brother. Simple wall wart, set and forget.

Cons: none to speak of

Other Thoughts: It's size is limited to small batteries, utility sized, not really big enough for more than a **small** motorcycle and as it's called a tender, not a charger, it's meant to be left on a charged battery.

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  • Robert B.
  • 6/23/2014 11:11:17 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

1 out of 5 eggsUnit went bad

Pros: The unit was purchased from Newegg when it was on sale.
It worked well for two days.

Cons: The unit worked good for two days and then went bad. I put it in the trash, and purchased a Yuasa SmartShot 900.
The Yuasa has worked well.

Other Thoughts: The Yuasa uses a transformer in place of the switching circuit on the input. I think this gives better reliability.

Did you find this review helpful? Yes No

  • Craig M.
  • 6/19/2014 8:49:03 PM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsWorked slowly but well

Pros: Recharged motorcycle battery parked for 8 months in two days. I thought the battery might be trash by now, but it charged right up.

Cons: Not the fastest charger, but I wanted a trickle charger, and I'm very pleased.

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  • Michael B.
  • 6/4/2014 11:18:51 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggs

Pros: Works great. I used this tender to charge and maintain my motorcycle battery and have had no complaints. The battery was almost dead and it took about 12 hours before the tender was just maintaining the charge.

Cons: none

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  • christopher b.
  • 5/9/2014 4:23:12 PM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggs

Pros: Works great. Does what it's supposed to.

Cons: No problems

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  • mike n.
  • 5/7/2014 6:57:25 PM
  • Tech Level: Average
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsspend a little more

Pros: Lightweight

Cons: Cheap garbage. Will only charge a battery that is already charged. A weak or dead battery? Forget about it!

Other Thoughts: Item was sent opened and incomplete. Who does that? Don't send an item that someone else returned.

Did you find this review helpful? Yes No

  • Tracy T.
  • 4/20/2014 11:51:26 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year

5 out of 5 eggsBattery Tender Makes an awesome product!

Pros: Awesome product! Call manufacturer to find out if you have a genuine Battery Tender.

Cons: No fault to newegg, One of the sellers in the marketplace is selling fake battery tenders. So call to make sure yours is real!

0 out of 1 people found this review helpful. Did you? Yes No

  • john p.
  • 4/4/2014 12:41:23 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsGreat Little charger

Pros: Charged a very weak battery on my lawn tractor and it started up fast after full charge. very happy with this charger.

Cons: none

Did you find this review helpful? Yes No

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