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.