CCell's M3 Battery which only needs to charge for about an hour to an hour and a half. When your battery starts to blink ten times with the green light, that means it is time to charge. When it is ready, it will stay a steady green light. You can plug it into any USB port such as your computer, a wall outlet, and so forth. When you are ready to use, the bottom light will illuminate while the heater is activated, and you only need to inhale for 2-4 seconds at a time to produce a surprisingly large and super smooth draw. The battery will last you for many draws. Some of our colleague's battery will last for over a day with steady use.