Spare 10440 Cell Battery For Reylight Only! - CountyComm

Spare 10440 Cell Battery For Reylight Only!

Regular price $6.25
Add to Wishlist

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 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.
  • 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

    Customer Reviews

    Based on 3 reviews
    Jeb M (Columbus, US)
    Great LIttle LIght

    This light is so handy, remarkably bright, and inexpensive to operate with the rechargeable battery. That battery is responsible for the additional power this light provides. But as a bonus, any AAA battery can be used, although with a reduced output.

    PAULIE D (Pittston, US)

    It is always prudent to have a back-up at all times when it comes to your survival equipment and flashlights are no exception! Having a spare on stand-by is a good idea.

    Fred Karasek (Rancho Cucamonga, US)
    Perfect for my application

    Charges to 4.1vdc and powers my ReyLight Copper AAA/10440 perfectly.
    Totally satisfied with my purchase.

    Zulu™ & Maratac™ Are Registered Trademarks Of CountyComm
    WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to

    Warning: This product may contains chemicals, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to