Spare 10440 Cell Battery

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 -------------------------------------- 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 lit