Unique feature:with LCD to display battery power & puff1. 650mah / 900mah / 1100mah / 1300mah Optional 2. Short-circuit protection- when short circuit,the battery will shut down.The battery wouldn't go back to work untill the ends of circuit. 3. Switch protection- press the button 5 times within 1.5 seconds, lock/nolock 4. Atomizer protection- If you press the button for by 10 seconds,the battery will be locked untill the next press. 5. Low voltage protection- When the battery voltage is lower than 3.3v,the battery will shut down. 6. Charge- Blue led blinks 5 times, ego usb charge can be used.Specification: