10440 - > AAA Size 3.7V 350 MAH 

• Model:3.7V 350MAH AAA ICR 10440 Battery
• Diameter:0.41 inch*Height:1.75 inch
• Do NOT use these batteries in flashlights that require 1.5V batteries.

Charging Output for 10440 Battery 4.2V @ 1A Max

Note only charge at .5A-1A for 10440 Cells to safely prolong the battery life upto 2000 cycles

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We have received hundreds of emails asking for a light which uses a 10440 cell battery.  We now have the ReyLight Copper AAA/10440 light which works with both cell variants. 

Why use a 10440 Lithium cell? Higher voltage = Much brighter & also rechargeable 

Warning: Dont use this cell in another AAA or Maratac light you have as it will void you warranty and destroy the light. Misusing or mishandling a lithium-ion battery may cause a FIRE or EXPLOSION which can result in INJURY or DEATH. You MUST read the safety warnings and resources before purchasing, using, and/or handling batteries.

• Misusing or mishandling lithium ion batteries can pose a SERIOUS RISK of personal injury, property damage, or death
• Only use in a device which as a smart BMS built in
• Note the length of the cell to ensure it will work in your application as well
• If your flashlight were the only device into which a buyer might attempt to insert the battery, there’d be no issue. However, since it is a great battery, others may buy it for other purposes. They need to be warned of its limitations.
• BATTERIES MAY EXPLODE, BURN, OR CAUSE A FIRE IF MISUSED OR MISHANDLED
• ONLY use with proper protection circuitry
• ONLY use within manufacturer specification
• DO NOT store loose in pocket, purse, etc. – always use a protective case
• KEEP AWAY from metal objects to prevent short circuiting
• DO NOT short circuit
• DO NOT use if wrapper or insulator is damaged or torn
• DO NOT use if damaged in any way
• DO NOT overcharge or over-discharge
• DO NOT modify, disassemble, puncture, cut, crush, or incinerate
• DO NOT expose to liquids or high temperatures
• DO NOT solder
• User must be familiar with handling lithium ion batteries before purchase
• Usage of batteries is AT YOUR OWN RISK