10440 Lithium-Ion 3.7V 350mAh Rechargeable Battery

Compact Power for High-Output Devices. Built for the Serious User.

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Designed for High-Performance Flashlights

The 10440 Lithium-Ion 3.7V 350mAh Battery is built for users who require more than what a standard AAA can deliver. With 3.7V output and 350mAh capacity, it powers select high-lumen tools—like the ReyLight Copper AAA/10440 flashlight—with increased brightness and extended runtime.

This cell is not for casual use. It’s engineered for compatibility with smart, BMS-equipped devices that are designed to handle higher voltage. When used correctly, it offers repeatable, reliable performance for tactical lighting, EDC kits, and professional loadouts.

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Why Choose This Battery

• High Output Performance – 3.7V power increases brightness for compatible lights

• Rechargeable Efficiency – Up to 2000 cycles with proper charging care

• Compact Energy – AAA-sized cell fits select high-performance lights

• Trusted by Enthusiasts & Pros – Preferred by flashlight builders and EDC users who know their gear

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Specifications

• Model: 10440 ICR Lithium-Ion

• Voltage: 3.7V

• Capacity: 350mAh

• Size: Diameter 0.41 in, Height 1.75 in

• Max Charge Voltage: 4.2V

• Recommended Charge Rate: 0.5A–1A

• Cycle Life: Up to 2000 cycles (with proper care)

• Packaging: Ships via ground only (Lithium hazmat compliance)

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Critical Usage Warning – Read Before Purchase

This battery is NOT compatible with standard AAA flashlights.
Attempting to use it in 1.5V devices will destroy your gear and void warranties.

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Safe Handling Guidelines

• Use only in devices designed for 3.7V 10440 lithium-ion cells

• Charge only with verified 10440-compatible lithium-ion chargers

• Do NOT store loose—always use a protective battery case

• Avoid contact with water, heat, or metal objects

• Do not use damaged batteries (torn wraps, dents, or exposed insulators)

• Never overcharge above 4.2V or discharge below 3.0V

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Liability Statement

By purchasing this battery, you accept full responsibility for proper handling, usage, and storage. Misuse of lithium-ion batteries can result in fire, injury, or worse. This battery is for experienced users only.

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High-performance gear requires high-performance power—and this cell delivers, when used with intent and responsibility.

Add it to your kit only if you know what you're doing.