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Battery Tender Junior 12V 750mA Battery Charger and Maintainer for Motorcycles and Powersports (021-0123)
12 V, 750 mA, 4-stage charging For 3–30 Ah lead-acid batteries

Official product photos: Battery Tender · source More photos on Amazon

Best motorcycle battery maintainer Battery Tender · Motorcycle Gear

Battery Tender Junior 12V 750mA Battery Charger and Maintainer for Motorcycles and Powersports (021-0123)

Keep your bike's battery ready through winter storage: an automatic 4-stage maintainer sized for small batteries.

RightScore Score pending
Best for Cold weather DIY projects

Amazon

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  • 12 V, 750 mA, 4-stage charging
  • For 3–30 Ah lead-acid batteries
  • 5-year limited warranty

At a glance

Our verdict

For keeping a motorcycle or other small vehicle battery healthy through storage, the Junior is the simple, proven choice, with a five-year limited warranty. Know its limits: at 750 mA it is a maintainer rather than a fast charger, it is not listed for lithium batteries, and it is too small for most car batteries.
RightDeals research · checked 12 Oct 2026
Motorcycles, ATVs and lawn tractors often sit for weeks, and their small batteries go flat fast. The Battery Tender Junior is a fully automatic 12 V charger and maintainer that delivers 750 mA through four stages — initialization, bulk, absorption and float — then holds the battery at full charge without overcharging. It suits flooded, AGM, GEL and sealed lead-acid batteries from 3 to 30 Ah, adjusts for temperature, and is spark-proof with reverse-polarity and short-circuit protection. The included 2-in-1 cable has both alligator clips and a ring-terminal lead you can leave on the bike.

Why you’ll like it

  1. 01

    Set and forget: it charges, then switches to float maintenance so the battery stays full all season without overcharging.

  2. 02

    Easy hookup: the 2-in-1 cable gives you alligator clips, or a ring-terminal lead that can stay on the bike.

  3. 03

    Safe to connect: spark-proof clips plus reverse-polarity and short-circuit protection.

  4. 04

    Clear status at a glance: red means charging, flashing green means almost full, solid green means maintaining.

Great for

  • Motorcycle riders who store their bike over winter
  • Owners of ATVs, scooters, lawn tractors and other small 12 V batteries

Maybe skip it if

  • Your bike has a lithium battery
  • You mainly need to maintain a full-size car battery

Where it shines

How well it suits each use, based on its specifications.

  • Cold weather Great
  • DIY projects Great
  • Emergencies OK

Pros & cons

Pros

  • Fully automatic 4-stage charging
  • Ring terminals and alligator clips included
  • 12.3 ft total reach
  • Compact 0.65 lb charger

Cons

  • Slow for recharging a deeply drained battery
  • Not listed for lithium (LiFePO4) batteries

Based on the maker’s specifications and published information — every point is checked against a named source.

Where to buy

Stores we link to in US. We show a price only when it is live.

Prices for United States in USD
Amazon

Amazon

Amazon shows the live price and stock

Live price on Amazon

Prices change often, so we send you to Amazon for the current one instead of showing an old price.

We may earn a commission when you buy through our links. It never changes how we rank products. How we make money

More stores and live prices are added automatically as we connect store feeds.

Specifications

General

Limited warranty
5 years

Battery

Battery types
Flooded, AGM, GEL, sealed lead-acid
Battery size range
3–30 Ah

Design

Cable reach
10.8 ft output cord + 1.5 ft accessory (12.3 ft reach)

Dimensions

Charger size
4.4 x 2.15 x 2.9 in

Features

Charging stages
4 (initialization, bulk, absorption, float)
Protection
Spark-proof, reverse polarity, short circuit; temperature compensated

Size & weight

Weight (charger only)
0.65 lb

Power

Output
12 V, 750 mA
Input
120 V AC, 50/60 Hz

Source: RightDeals research · verified 2026-10-12

Our score is on its way

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How We Rank Products

What buyers say

We only show star ratings we are licensed to display. Read verified buyer reviews and photos directly on Amazon.

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Questions people ask

Can I leave it connected all winter?

Yes, that is what it is for. After charging it switches to float maintenance and keeps the battery at full charge; a solid green light means it is maintaining.

What does a flashing red light mean?

Battery Tender says it signals a fault, usually reversed polarity or a battery too deeply discharged to accept a charge.

Sources & method

Researched from the maker’s specifications, the store listing and published information — not lab-tested. We never accept payment for a recommendation.

How We Rank Products · Editorial policy

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