Features: 1> Brand new and high quality 2> It can be recharged repeatedly 3> Built-in protection circuit PCM for prevent over charging or over discharging It can not use for any drone and other aircrafts. Specifications: 1> Rated Capacity: 850mAh 2> Size: 7mm(H) x 30mm(W) x 40mm(L) 3> Operating Voltage: 3.7V 4> Charging voltage limit: 4.20V 5> Discharge voltage: 3.0V 6> Charging cut-off current: 0.02C 7> Standard Charge: 0.2C(170mA) 8> Standard Discharge: 0.