Can I leave this connected to my motorcycle all winter without damaging the battery?

Yes! Battery Tender Junior switches to float/maintenance mode at full charge, offsetting self-discharge to keep at 100% without overcharging or damage. Unlike trickle chargers, it adjusts output to battery needs for safe long-term storage.

What size batteries can this charge? Is it good for small motorcycle batteries?

Battery Tender Junior 750mA is ideal for 3–30Ah batteries in motorcycles, ATVs, UTVs, scooters, PWCs, and snowmobiles. Safely charges small 3–5Ah batteries overnight and larger 14–20Ah motorcycle batteries in ~14–22 hrs.

Will the Battery Tender Junior work on my Harley-Davidson?

Yes, Battery Tender Junior works with all Harley-Davidson 12V models, including Sportster, Softail, Dyna, Touring, CVO, and Pan America. The 750mA output is ideal for Harley batteries, and the included harness allows easy plug-in charging.

What is the difference between this and a trickle charger?

A trickle charger delivers constant current and can overcharge a battery during storage. The Battery Tender Junior is a smart charger that automatically switches to float mode, charging only when needed for safe long-term maintenance.

Will this charge a completely dead battery?

Battery Tender Junior can recover most deeply discharged batteries using low-voltage recovery during startup. Batteries below 2V or left discharged too long may be permanently damaged. Red LED = charging; flashing red may indicate a bad battery.

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Battery Tender Junior 12V, 750mA Charger and Maintainer: Automatic 12V Powersports for Motorcycle, ATVs, and More - Smarter Than a Trickle Charger - 021-0123

Product ID: 764139

Details

Brand
Battery Tender
Color
Black/Green
Output Voltage
12 Volts
Product Dimensions
2.9"D x 2.15"W
Specification Met
CSA ETL FCC

⚡750mA optimized charging current

🔋12V output for versatile powersports

🛡️5-year warranty + lifetime support

¥14669

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

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Description

🔌 Stay powered, stay ahead — smarter charging for the modern rider

SAFETY FIRST - Spark-proof circuitry & reverse hookup detection for worry-free use
COMPACT PORTABLE - Lightweight 1 lb design fits anywhere, perfect for on-the-go pros
REAL TIME MONITORING - Two-color LED status keeps you informed, auto float mode prevents overcharge
SMART 4 STEP CHARGING - Maximizes battery life with Initialization, Bulk, Absorption & Float modes
UNIVERSAL COMPATIBILITY - Works seamlessly with all 12V lead-acid, AGM, flooded & gel batteries

The Battery Tender Junior 12V, 750mA Charger and Maintainer is a compact, intelligent battery charger designed for motorcycles, ATVs, and other 12V powersports vehicles. Featuring a 4-step charging process, spark-proof safety, and universal battery compatibility, it ensures optimal battery health and long-term maintenance. With a 5-year warranty and lifetime support, it’s the trusted choice for professionals who demand reliable power management.

Specifications

ASIN	B000CITK8S
Amperage	0.75 Amps
Best Sellers Rank	#476 in Automotive ( See Top 100 in Automotive ) #5 in Battery Chargers
Brand	Battery Tender
Built-In Media	Battery Tender 021-0123
Color	Black/Green
Connector Type Used on Cable	Alligator Clips, Ring Terminals
Current Rating	750 Milliamps
Customer Reviews	4.8 4.8 out of 5 stars (49,814)
External Testing Certification	Não Aplicável
Global Trade Identification Number	00734357000078
Input Voltage	12 Volts
Item Dimensions D x W x H	2.9"D x 2.15"W x 4.4"H
Item Type Name	BATTERY_CHARGER
Manufacturer	Deltran
Mfr Part Number	021-0123-CA
Model Number	021-0123
Number of Ports	1
Output Voltage	12 Volts
Specification Met	CSA, ETL, FCC
Unit Count	1.0 Count
Warranty Description	Manufacturer Warranty

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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¥14669

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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Great experience from order to delivery. Highly recommended!

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