Ooze 650 Twist Grade A Battery - Black510 Thread, Variable Voltage 3.3V - 4.8VAvailable Colors: Black/ChromeMatte Finish 2 Click Pre-Heat Mode 20sec Auto-Shut-Off 650 mAh Battery 3.7VTwist to adjust: 3.3V - 4.8V Voltage510 ThreadOn/Off Function/Click 5 Times FastCharger Not Included