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

4.8 out of 5 stars 3,046 customer reviews
| 278 answered questions

List Price: $73.95
Price: $45.20 & FREE Shipping. Details
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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
See more product details
142 new from $39.20 3 used from $36.16 1 refurbished from $39.95
$45.20 & FREE Shipping. 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: $64.82
Buy the selected items together

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Product Information

Technical Details

Brand Battery Tender
Model 021-0128
Item Weight 2.3 pounds
Product Dimensions 11 x 4 x 11 inches
Origin China
Item model number 021-0128
Manufacturer Part Number 021-0128
OEM Part Number 021-0128
ABPA Partslink Number 13
Amperage 1.25 A
Voltage 12 volts

Technical Specification

Product Warranty: For warranty information about this product, please click here [PDF ]

Additional Information

ASIN B00068XCQU
Customer Reviews
4.8 out of 5 stars 3,046 customer reviews

4.8 out of 5 stars
Best Sellers Rank #71 in Automotive (See top 100)
#4 in Automotive > Tools & Equipment > Jump Starters, Battery Chargers & Portable Power > Battery Chargers
#7 in Automotive > Replacement Parts > Batteries & Accessories
Shipping Weight 2.8 pounds (View shipping rates and policies)
Domestic Shipping Item can be shipped within 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 ]

Product Description

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

Smart Charging Made Easy

Automatically switches from full charge to float charging mode. Battery Tender at 1.25 amps will charge as fast or faster than any 3 amp charger available.

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 Reviews

Top Customer Reviews

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.
22 Comments 547 of 554 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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By Hal on March 6, 2008
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.
5 Comments 196 of 201 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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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 ›
3 Comments 134 of 144 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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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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I recently purchased a Deltran Battery Tender Plus (they are made in China) battery charger for a total cost of $63.30. It has never worked correctly from the first day I got it. It charges great, but it never goes into the "storage" mode, or notifies you that the battery is at 80% charged. It apparently just keeps charging the battery whether it needs it or not.

I contacted Deltran's "technical" department a few times about the problem, and told them that I suspected the charger was faulty, but they kept telling me it was the battery, or "check this" or "check that" or "the weather was too cold" (in Florida), even though I had told them the battery was new. So, figuring they knew what they were talking about, I purchased another brand new battery at the cost of $79.92.

I left the "new" battery on this charger for a few days, and it was the same thing as the "old" battery. The charger never showed a full charge or went into storage mode.

So now that the equipment that this battery is from has been out of service for a couple of weeks, (because Deltran recommended I remove the battery from the equipment since I was having a problem charging it), and I couldn't afford to fiddle around any longer, I bought a competitors battery charger for $46.45, and as it turns out after connecting the new charger, within a matter of a few minutes both the "old" and the "new" batteries showed fully charged, and the new (competitors) charger went into "storage" mode with no problem.

Now that I knew for sure that this Deltran Battery Tender Plus charger was not working properly, I reviewed the Battery Tender Plus "LIMITED" 10 year warranty, and found out they (Deltran) wants a $9.
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Deltran Battery Tender (021-0128) 1.25 Amp Battery Charger
This item: Deltran Battery Tender (021-0128) 1.25 Amp Battery Charger
Price: $45.20
Ships from and sold by Amazon.com