Zoom Rechargeable battery for Q4 Recorder

All you need to power the Q4 is the single supplied lithium-ion (Li-Ion) battery, which can be recharged with the use of an optional AC adapter or by connecting the Q4 to your computer via USB. Battery life is approximately three hours when shooting video at 720p/30fps, or two hours when shooting high-definition 1080/30fps video, giving you the freedom to leave the studio behind and explore the world around you.