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.

MPN: BT02
UPC: 884354013042

• Provides up to 3 Hours Recording
  
• 3.7V Average; 1050 mAh Capacity
  
• Charges in 2 Hours 15 Minutes on AC
  
• Charges in 3 Hours on USB
  
• Chemistry Lithium-ion
  
• Capacity 1050 mAh
  
• Output Voltage Nominal: 3.7 VDC
  
• Maximum: 4.2 VDC
  
• Operating Time While Recording 720p30: Up to 3 hours
  
• Charging Time USB: About 3 hours
  
• AC Adapter: About 2 hours 15 minutes