This is the LiPo Battery for the Estes Proto-X Nano Quadcopter.
Charges through a USB port in a personal computer
1S 3.7V 100mAh LiPo Battery with Micro Connector with double sided
tape for mounting
USB Charge Cord, ESTE4616
Dimensions: 0.71 x 0.63 x 0.27" (18 x 16 x 7mm)