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The BT-02 1050 mAh Rechargeable Battery for Zoom Q4 from Zoom is estimated to power the camcorder while recording 720p30 video for up to three hours. It features a capacity of 1050 mAh, and delivers an average current of 3.7V DC. When charging from the ZOOM AD-17 AC adapter it can fully charge in about two hours fifteen minutes, and from USB in about three hours.
Table of Contents
Nominal: 3.7 VDC
Maximum: 4.2 VDC
While Recording 720p30: Up to 3 hours
USB: About 3 hours
AC Adapter: About 2 hours 15 minutes