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Battery Tender 021-0123 Battery Tender Junior 12V Battery Charger

4.7 out of 5 stars 5,748 customer reviews
| 395 answered questions

Price: $25.59 & FREE Shipping on orders over $49. Details
In Stock.
Ships from and sold by Amazon.com.
Battery Charger
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  • Spark proof during lead connection, reverse polarity protected and includes a 12-foot output cord and 5-year warranty
  • Perfect for charging all 12-volt lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell)
  • Complete 4-step charging program (Initialization, Bulk Charge, Float Mode) allows for optimization of battery power, without overcharging
  • Automatic charge cycle functionality switches to float mode after fully charging the battery
  • Solid state two color LED indicates stage of charger. Not for sale in California and Oregon
$25.59 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

  • Battery Tender 021-0123 Battery Tender Junior 12V Battery Charger
  • +
  • Battery Tender 081-0069-6 Ring Terminal Harness with Black Fused 2-Pin Quick Disconnect Plug
  • +
  • Battery Tender 081-0148-25 25' Quick Disconnect Extension Cable
Total price: $47.05
Buy the selected items together


Product Information

Style:Battery Charger

Technical Details

Brand Battery Tender
Model Battery Tender Jr. Battery Charger
Item Weight 1.8 pounds
Product Dimensions 8 x 4 x 9 inches
California residents Click here for Proposition 65 warning
Item model number 021-0123
Manufacturer Part Number 210123
OEM Part Number 021-0123
ABPA Partslink Number 13
Folding No
Amperage 0.75 A
Voltage 12 volts

Technical Specification

Warranty [pdf ]

Additional Information

ASIN B000CITK8S
Customer Reviews
4.7 out of 5 stars 5,748 customer reviews

4.7 out of 5 stars
Best Sellers Rank #56 in Automotive (See top 100)
#1 in Automotive > Tools & Equipment > Jump Starters, Battery Chargers & Portable Power > Battery Chargers
#2 in Automotive > Replacement Parts > Batteries & Accessories
Shipping Weight 1.8 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available October 2, 2000

Warranty & Support

Warranty, Parts:PartsWarranty, Labor:Full Manufacturer's Warranty
Product Warranty: For warranty information about this product, please Click here [PDF ]

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Product Description

Style: Battery Charger

Battery Tender Junior 12V Battery Charger is much more than a trickle charger. It has a brain, is lightweight, compact, fully automatic and very easy to use especially in small spaces. This battery charger will keep the battery fully charged so that it is ready to go always. 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. An optional 25 feet extension cord (part number 081-0148-25) is sold separately.

From the Manufacturer


Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By Shawn Murphy on September 21, 2009
Style Name: Battery Charger Verified Purchase
In the analysis of buying a Tender Jr. vs. a Tender Plus, the main issues are time to full charge, battery size, & parasitic draw. The Tender Plus (1.25) will get the job done twice as fast as the Tender Jr. (0.75). Both now are similar architecturally, save it be the charging power & lack of temperature compensation on the Jr. They both are 4 stage, both have the same sophisticated computer chip technology running the charging process, etc... I spoke to The Deltran(The Manufacturer) customer service department on 3 different occasions, making sure I had the facts right. The first 2 times I was misinformed about the temperature compensation issue. I am editing this review to be accurate as of today's date of 12/01/10. Because The Plus will bring a battery to full charge twice as quickly as The Jr. will, The Plus has a much better chance at overcoming a parasitic draw on your batteries power. Modern cars have sophisticated electronics that require constant power 24/7. Check all your battery connections & your alternator belt!!! If the connections are not clean & tight, clean it with original coca-cola and a rag / brush, make sure they fit snugly. If your alternator belt is too loose it will not charge your battery properly. If you only want to buy one Tender, don't cheap out, buy The Plus if you have the money to do so. If you want to buy 2 or 3 Tenders to make sure all your batteries are fully charged, the Jr. will probably do just fine. I personally alternate The Jr. between 3 different cars, if I had it to do over again, I would buy The Plus instead as I am not a patient person. Both models will turn off in 72 hours automatically if a full charge is not reached, & neither will start charging without at least 3 volts stored in the battery before initiating a charge.Read more ›
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Style Name: Battery Charger Verified Purchase
I purchased 4 of these as I have had battery tenders over the years and they worked flawlessly, not these new ones made in CHINA (JUNK!). I noticed that the red light was on all the time (charging) and it should only stay on for a short while than when battery is charged it goes to green. I checked the voltage output and found only putting out 9.01 vdc (should be over 12vdc), called customer service and they wanted to charge me a "warranty return fee" and possibly other chargers also on top of shipping charges to get the faulty product back to them.-these are less than 9 months old! The cost to have this item warrantied far exceeds what I paid for it. To bad, battery tender USED to be a great way to keep batteries at optimum condition, I had to go out and purchase battery minder units to use in stead. I AM REALLY DISAPPOINTED IN YOUR POOR QUALITY AND LACK OF WARRANTY TO STAND BEHIND YOUR PRODUCT BATTERY TENDER. I hope others may read this and not make the same mistake I made.BUYER BEWARE!
8 Comments 169 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: Battery Charger Verified Purchase
This is the ubiquitous Battery Tender Jr., manufactured by Deltran. There are quite a few float charger type products out there that bill themselves as "battery tenders" but the actual product name of this is "Battery Tender Jr." - they have other Battery Tender products, including one with higher charging output, and one with more outputs for charging multiple batteries.

But let's first get back to basics: what is a float charger, and why is it needed?

Lead-acid batteries, of the type used in cars and motorcycles, lose a part of their charge over time just sitting when they aren't even connected to something. When left in a bike that has a clock or radio memory circuit in it that constantly draws power even when the bike is off, that loss of charge is even faster.

Lead-acid batteries "like" to remain at full charge at all times. A battery that is kept at full charge will have a much longer service life than a battery that is left sitting with less than a full charge.

I used to go through a lot of batteries - my motorcycle batteries would last between one and two years before they needed replacement. With multiple motorcycles (not to mention other battery powered things like a generator, snow blower, etc.) this gets expensive!

I figured I would put a trickle (float) charger on my main GL1100 battery to help keep it fully charged. I bought a cheap trickle charger from Harbor Freight, for under $10. I hooked it up to the battery and left it sitting overnight. The next day, to my utter surprise, the battery was dead! The cheap trickle charger, with no intelligence in it and no way of turning off when the battery was charged, overcharged the battery, destroying it!
Read more ›
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Style Name: Battery Charger Verified Purchase
I bought my first Battery Tender Jr. about 20 years ago (for an antique car that I drove infrequently) and it worked fine for over 15 years. I included it with that antique car when I sold it, and as far as I know, it still works.

Based on my prior experience, on November 4, 2010, I bought another Battery Tender Jr. from Amazon for another infrequently driven car. It is now less than 1 year later, and that Battery Tender Jr. got so hot that the plastic case buckled and separated at the seam. So, planning to return it under warranty, I read their terms. Not only do I have to pay to ship that defective unit back to Deltran (which I expected), they also charge a fee for "Warranty Evaluation, Shipping & Handling"! That is OUTRAGEOUS! Since I have my receipt, my fee would be only $7.95 (if no receipt, fee is $11.95). It would cost me $18.90 ($7.95 plus $10.95 USPS Flat Rate medium box) to return it (or $22.90 if I didn't have a receipt - which is more than the $21.39 cost of a new one from Amazon delivered!) Why bother with a warranty claim? If that was Deltran's plan from the outset - to discourage warranty claims - their so-called "warranty" is a fraudulent misrepresentation.

No doubt that my first, 20-year old Battery Tender Jr. was made in the USA. Not so with the second one - the label says "Made in China". A piece of Junk!
87 Comments 643 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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