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 smart charging current

🔋12V output for versatile powersports

🛡️5-year warranty + lifetime support

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฿4364

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Power up smarter, ride longer — never get left stranded again!

SAFETY FIRST TECH - Spark-proof circuitry and reverse polarity detection keep your battery and you safe every time.
COMPACT PORTABLE - Lightweight (1 lb) and sleek design fits anywhere—perfect for on-the-go pros who demand convenience.
SMART 4 STEP CHARGING - Optimizes battery health with Initialization, Bulk, Absorption & Float modes—no overcharge, no damage.
UNIVERSAL COMPATIBILITY - Works seamlessly with all 12V lead-acid, AGM, flooded, and gel cell batteries—one charger for all your rides.
REAL TIME CHARGE MONITORING - Two-color LED status updates + adaptive charging ensure your battery stays perfectly topped off.

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 compatibility with all 12V lead-acid battery types, it ensures optimal battery health and longevity. With a 5-year warranty and lifetime support, it’s the trusted choice for professionals who demand reliable, hassle-free battery maintenance.

Specifications

ASIN	B000CITK8S
Amperage	0.75 Amps
Best Sellers Rank	#490 in Automotive ( See Top 100 in Automotive ) #6 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 (49,730)
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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฿4364

Duties & taxes included

In stock

Sold byAmazon ThailandDelivered 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 Thailand.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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