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Deltran Battery Tender (021-0128) 1.25 Amp Battery Charger

4.8 out of 5 stars 3,291 customer reviews
| 327 answered questions

Price: $43.49 & FREE Shipping on orders over $49. Details
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Battery Charger
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  • Battery Tender Plus 12V - 1.25 Amp, Automatically switches from full charge to float charging mode
  • The Battery Tender Plus is a 1.25-amp battery charger designed to fully charge a battery and maintain it at proper storage voltage without the damaging effects caused by trickle chargers
  • Included is a quick connect harness for hard to reach areas
  • Temperature compensated to ensure optimum charge voltage according to ambient temperature
  • Battery Tender at 1.25-amp will charge as fast or faster than any 3-amp charger available, Reverse Polarity Protection to ensure user safety Red and Green Lights Alternately Flash in this condition
  • This item is not California or Oregon energy compliant.
  • To purchase charger if you live in California or Oregon please see attery Tender 022-0185G Charger/Maintainer
171 new 1 refurbished from $34.95
$43.49 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

  • Deltran Battery Tender (021-0128) 1.25 Amp Battery Charger
  • +
  • Battery Tender 081-0148-25 25' Quick Disconnect Extension Cable
  • +
  • Battery Tender 081-0069-6 Ring Terminal Harness with Black Fused 2-Pin Quick Disconnect Plug
Total price: $64.95
Buy the selected items together


Product Information

Style:Battery Charger

Technical Details

Brand Battery Tender
Model 021-0128
Item Weight 2.3 pounds
Product Dimensions 11 x 4 x 11 inches
California residents Click here for Proposition 65 warning
Item model number 021-0128
Manufacturer Part Number 021-0128
OEM Part Number 021-0128
ABPA Partslink Number 13
Folding No
Amperage 1.25 A
Voltage 12 volts

Technical Specification

Additional Information

ASIN B00068XCQU
Customer Reviews
4.8 out of 5 stars 3,291 customer reviews

4.8 out of 5 stars
Best Sellers Rank #357 in Automotive (See top 100)
#5 in Automotive > Tools & Equipment > Jump Starters, Battery Chargers & Portable Power > Battery Chargers
#15 in Automotive > Replacement Parts > Batteries & Accessories
Shipping Weight 2.8 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, 2003

Warranty & Support

Warranty, Parts:PartsWarranty, Labor:Full Manufacturer's Warranty - Sold by Authorized Reseller
Product Warranty: For warranty information about this product, please click here [PDF ]

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Product Description

Style: Battery Charger

Battery Tender Plus 12V - 1.25A. The Battery Tender Plus is a 1.25-amp battery charger designed to fully charge a battery and maintain it at proper storage voltage without the damaging effects caused by trickle chargers. Included is a quick connect harness for hard to reach areas. Temperature compensated to ensure optimum charge voltage according to ambient temperature. Automatically switches from full charge to float charging mode. Battery Tender at 1.25-amp will charge as fast or faster than any 3-amp charger available. Reverse Polarity Protection to ensure user safety. Red & Green Lights Alternately Flash in this condition. Complete 4-step charging program (Initialization, Bulk Charge, Absorption Mode, Float Mode). 10 year warranty.

From the Manufacturer

Battery Tender Junior Battery Tender Junior High Effiecency Battery Tender Junior Lithium Battery Tender 800 Battery Tender Plus Battery Tender Plus High Efficiency
Battery Tender Junior Battery Tender Junior High Efficiency Battery Tender Junior Lithium Battery Tender 800 Battery Tender Plus Battery Tender plus High Efficiency
Part Number 021-0123 022-0192 022-0198Li 022-0150-DL-WH 021-0128 022-0185G
Warranty 5 Years 5 Years 5 Years 3 Years 10 Years 5 Years
Input/Output 12V @ 750mA 12V@750mA 12V@750mA 12V@800mA 12V@1.25A 12V@1.25A
4-Step Charging
Spark Proof/ Short Circuit Protected
Safety Timer 80 Hours 80 Hours 80 Hours 72 Hours 72 Hours
Water Resistant
For Sale in CA or OR
Reverse Polarity Protected

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By F. Dumanoir on June 22, 2007
Style Name: Battery Charger Verified Purchase
Every time I want to fire up my old 71 Datsun (that's Nissan for those of you younger than 30) 240 Z there's a good chance that the battery has drained down and that I can't start it! Looking around at car forums I read about this nifty little gadget....It's like a battery trickle charger....sort of. Whereas it's not recommended to keep a trickle charger hooked up all the time, this one has circuitry to limit the current and sense when the battery needs charging. It only charges at 1.25 amps which is easier on the battery.

I've had it on for a month now and it's great. The first couple of days, the red light was on indicating charging. Since then it's been on green and the car starts right up. I live in Houston where the heat and humidity can be just as brutal on batteries as the cold.

I highly recommend this "tender" for those that have cars that stay unused for long periods.

As other reviews have mentioned it comes with a set of adapters that allow you to permanently attach pigtails to the battery posts and then you can quickly connect the tender without having to use the alligator clips (also included).

For the price and free shipping you can't go wrong!

UPDATE after two years of use.
I can now reconfirm that these battery tenders work great - I've had them hooked up continuously on two cars that stay in the garage a lot and I've NEVER had them not start right up. A quick glance at the LED display lets me know that the batteries are either charging or fully charged. It's a real pleasure to be able to go right up and enjoy your wheels without having to worry about whether the battery is dead. I can't say for sure, but I suspect that it lengthens the life of the battery as well.
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By Hal on March 6, 2008
Style Name: Battery Charger Verified Purchase
This little gizmo is dynamite.

I have a 4 year old Accord that, due to circumstance, only has about 4400 miles. Rarely driven...and what driving is done is mostly at night.

Sat for a week once in very cold weather...dead battery.

Ordered this. Hooked it up. 100% charge and the battery is very powerful once again.( had thought I would probably need a new one).

It's very small size makes it extremely easy to use and store. And it will not overcharge, so you do not have to babysit the process.

It's LEDs glow red when charging. Green and red blink once 80% has been achieved. Solid green at 100%.

It did, in very cold weather, take a long time to establish a full charge on my almost completely discharged battery. The battery would have been usable in a few hours, but 100% took close to 18.

Highly recommended.
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Style Name: Battery Charger Verified Purchase
I bought one, for my own use and spent much time reading Deltran's website, and the finally the info that came with the Deltran unit.

Over all, Works well, made well (vented metal case). I've been testing it on a 55ah AGM.

I have a lot of background in battery chargers. Based on my review of the unit I bought, I wanted to maybe offer some general practical help for those that can't find all the info they need for guidance before they but such a product.

The price at Amazon makes it worth it, but not list at the OEM's site. The OEM list price is pricey for the Battery Tender Plus, the Battery Tender Jr is about 1/2 (based on the OEM price), and can take care of much of the same duties.

While I've read all I could from their site, all their advertising pre-sale doesn't warn that it may not charge a large cell that has been properly discharged. Once I bought my Battery Tender Plus, I found liteature comes with the charger that warns you of this..

I figured as much and bought it as a compliment to my smart bulk chargers that aren't good maintainers. The reason.......
If the power is interrupted on any of my bulk chargers, they don't come back to the correct profile, just the profile for 2amp charge for a wet cell general. Not the AGM profile.

The Deltran being a dedicated maintainer doesn't suffer from this problem.
If the power was to be cycled, it would just go through it's profile again. And since it's such low current, no harm.

These Tenders are Great for when the bulk charger is taken care else where on the larger RV, boat, or secondary car battery.
Read more ›
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Style Name: Battery Charger
I have an older version of this charger that I bought in the mid 90's. I used it to maintain my garaged Mustang's battery over the winter months for many years. I made a cigarette lighter adapter so all I needed to do was to plug it in instead of using the alligator clips. I have to say this thing is dead reliable! It always kept my battery in prime condition. I love it and recommend it highly.
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Style Name: Battery Charger
I purchased a Deltran Battery Tender Plus less than one year ago at an auto show in Atlantic City, NJ - It worked fine for about 6 months or so. When checked I found that it was not charging (no lights lit in any manner) Called Deltran -Informed to mail in the charger (I could not find any receipt) (cost $11.73 to mail to their Florida address.) Just received a call after about three weeks that yes, the charger had failed and that I was to get a new one....NOW THE CATCH - I had to pay an additional $17.95 for shipping to get the replacement... So far I would have out of pocket $29.68 for a charger that failed within the first year of use. No more Deltrans for me...Asked to have the bad one shipped back to me so at the next club meeting I could respond to the members of what had transpired and show them the faulty charger.
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