The Hubsan X4 Quadcopter Lithium-Polymer Flight Battery is a
3.7V, 380mAh lithium-polymer (LiPo) battery that is compatible with the
Hubsan X4 H107C and X4 H107D quadcopters. It features a USB connection
allowing it to be charged using a computer or other USB charger. It will
allow the quadcopter to fly for up to 7 minutes and charging is
estimated to take approximately 40 minutes.