The iJoy Captain can be powered by either (2) High Amp 18650 or (2) High Amp 20700 batteries depending on your personal preferences. The iJoy Captain offers this unique ability to choose from a 20700 or 18650 battery configuration using the included 18650 battery adapter sleeve. Batteries are easily removed and inserted using the sliding battery cover. The iJoy Captain also features a micro USB port for charging and future firmware updates. The iJoy Captain utilizes the IWEPAL chip which can fire up to 234 watts and has various temperature control modes.