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Battery Tender Plus 12v 1.25 Amp 4 Stage Smart Charger

Was: $71.95
Sale Price: $62.95
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Product InformationStore Part Number: 021-0128


Keep your batteries fully charged without the adverse effects possible with traditional motorcycle trickle chargers. The Battery Tender Plus smart charger from Deltran makes optimal battery storage a reality with its 12V, 1.25 amp design. In addition, leave the charger wiring attached to the battery while operating the vehicle with its E-Z quick disconnect harness.

Each Battery Tender Plus ships with one each quick disconnect ring set and alligator clips.


  • Temperature compensated to ensure optimum charge voltage according to ambient temperature.
  • Automatically switches from full charge to float charging mode.
  • 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).
  • Perfect for all lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell).
  • Safety timer: 72 hrs.
  • Certification: UL/CSA. FCC.
  • AC Power Cord Length: 6 ft. - 18AWG
  • DC Output Cord Length 4.5 ft. - 18AWG
  • DC Accessory Length 1.5 ft. - 18 AWG
  • 10 year Warranty!


* Flat Rate shipping is for the lower 48 states only.

Tech Specs

  • Dimensions (LxWxH): 4.875 x 3.25 x 2.875 in
  • Weight: 2.75 lb
  • Shipping Weight: 3.0 lb
  • DC Output Amps: 1.25
  • Absorption Voltage: 14.6 V
  • AC Input Volts: 115 V
  • AC Input Volts Freq.: 60 Hz
  • Max Inrush Current, Single Cycle: 0.36 A
  • Float Voltage: 13.3 V
  • Model: 021-0128
  • Manufacturer: Deltran
  • Power Factor: 0.8
  • Maximum Power (+/- 3%) @ 25° C: 18 W
  • Charge Reset: Battery Voltage Threshold: 12.5 V
  • Working Temperature: -20° to 60° C
  • Enclosure: Powder Coated Aluminum Chassis
  • Output Banks: 1
  • Temperature Compensation: Yes
  • Regulatory Approval: UL/CSA/FCC
  • Manufacturer Part #: 021-0128
  • UPC: 734357001280
  • Made In: Vietnam

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Reviews and Ratings

4.33 Average
5 Stars 5
4 Stars 0
3 Stars 0
2 Stars 0
1 Stars 1
Rated 4.33/5 Stars from 6 customer reviews.

Do you own the 021-0128? Please, tell us what you think about it. It helps us provide you with better products. Please note that it may take up to 72 hours for your review to appear.

works like my other battery tenders that are great
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Written by on Nov 14, 2019. Verified Purchase — (1 of 2 customers found this review helpful
Great Product
This product works just as described and is working perfectly. The only thing that surprised me was that it took a couple of days for the tender to completely charge the system before the light turned green. Of course, this was on my dodge diesel truck that has two batteries. Everything is now working as it should.
I am really happy with the Tender Plus.
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Written by on Jun 01, 2020. Verified Purchase — (3 of 3 customers found this review helpful
Worry free battery maintainer
The battery tender just works. It completes the whole charge cycle and finishes in a “storage maintenance state”. With the recent stay home orders, I use the charger on both cars to keep the batteries up with the infrequent vehicle usage. Newer cars tend to deplete the battery quicker with all the on board electronics and computers. So if the vehicle sits for a while, the battery will be discharged and eventually ruined. The battery tender is a 1.25 amp model so it takes about a day to fully charge a 60A/hr 450CCA car battery from a 75% charge. Over all a great product. This product is mainly a maintainer, so if you need a fast “jump charge” a higher amperage model would be more suitable.

BatteryStuff processed my order quickly and I had the unit in a few days. Order process was easy and no problems with the website.
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Written by on May 26, 2020. Verified Purchase — (3 of 3 customers found this review helpful
Excellent product
I own 3 battery tenders and they have never failed to keep my batteries topped off ready to go
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Written by on Jun 29, 2020. Verified Purchase — (2 of 2 customers found this review helpful
Good product
Does what it is advertised to do, simple to use. I'm satisfied. seems to be a good source.
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Written by on Jun 04, 2020. Verified Purchase — (1 of 1 customers found this review helpful
Not what I ordered; returned for the one I wanted.
The staff is top notch; resolved.
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Written by on Jan 02, 2020. Verified Purchase — (0 of 7 customers found this review helpful

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