Model No: Bonka U2 650mAh 75C 4S1P
Voltage: 14.8
Weight: 80g
Capacity: 650mAh
Dimensions: 25*38*62 (mm)
Continuous Discharge Current: 75C
Balance Plug: JST-XH
Burst Discharge Current:150C
Discharge Plug:  Yellow XT-30

Used in Stratos 200 or related size heli with 4s power.