18650 Battery
https://www.snsyiy.com/18650-Battery-Supply.html 18650 Battery3.7V 18650 rechargeable Battery Button Top Batteries USB Rechargeable Battery 3600mAh for Klarus Flashlight (XT11X, XT11GT, XT30R.) (2-Pack)Product Ddvantage Display3.7V 18650 lithium battery,...