The Armytek 18350 Lithium-ion battery (900 mAh) is ideal for use in Armytek LED lights that use this power source, such as:
Armytek Partner C1 Pro Tactical Flashlight
Armytek Elf C1 Rechargeable Headlamp
Armytek Prime C1 Pro Magnet USB Rechargeable Flashlight
Armytek Tiara C1 Pro Magnet USB Rechargeable Headlamp
The battery length is the same size as the CR123 battery, it can be used instead if the 1mm extra thickness is not a problem.