The EGO is rechargeable, and feels great in your hand. You get a very nice pull and large vapor cloud on every vapor puff. It is suitable for CE4 Cartomizers.
The battery has two modes to switch. One is the constant voltage output mode which gives constant 3.3V and is the same as the normal EGO. The other is variable voltage output mode, in which the voltage will change from 3.3V to 4.2V as the lithium battery power decreases.
The EGO 900mAh battery will work for approximately 8 hours on one full charge. It comes with a 5 click on/off feature so you can carry it around with you without fear of accidental activation.