EVOD 900mah battery customized for the EVOD clearomizer and other 510/ego threaded EVOD batteries tanks. EVOD batteries have a 3.7V constant output voltage, which makes its perform consistently no matter if the battery is fully charged or not.The battery’s button has a 5-click On/Off. Please press the button 5 clicks within 2 seconds and activate the battery on/off feature.Unit:1pc Kanger EVOD Battery Battery Size:Diametter 14mm; Length:85mm Battery Output Voltage: Constant 3.7v Battery Capacity:900mAh Battery button led: White Threading:510/eGo