This proprietary cell is designed for use in the Klarus XT11GT, but can be used in any 18650 flashlight. Capable of high current charge/discharge Multiple protections: Overcharge, over-discharge, short circuit, overheating 500 charge cycles Recommended 2A charging current (max 3.6A) Works between -10 and 60 degrees C Weight: 52g Length: 2.74" (69.6mm) Diameter: .725" (18.4mm)