Olight 3400mAh Protected Button Top Rechargeable 18650 Battery for Olight M22 M20S M1X M20X LED Flashlights and More High performance High Capacity 3400mAh 18650 Rechargeable Battery that maximize your flashlight runtime. Built-in protective circuit - overcharge, undercharge, over discharge protection Superior cycle life performance - you can recharge 500 cycles without deteriorating performance Trip overheat protection - extreme safe Include 1x Olight 3400mAh 18650 rechargeable battery & a bright Lumentac Keychain Light