The 
NUPROL LiPo Battery 1600mAh 11.1v 20c (STK|Small Tamiya)
 is a high-performance, stick-configuration lithium polymer battery designed primarily for upgraded airsoft guns, offering enhanced rate of fire and trigger response. It features a Small Tamiya connector and is also suitable for some RC vehicles. 
 
 
Key Specifications
According to Nuprol's product pages, the battery has the following specifications: 
Chemistry: LiPo (Lithium Polymer)
Voltage: 11.1V (3S cell count)
Capacity: 1600mAh
Continuous Discharge Rate: 20C (at 32A)
Burst Discharge Rate: 40C (at 64A)
Configuration: Stick
Connector: Small Tamiya
Balance Connector: JST-XH
Dimensions: Approximately 95 x 29 x 18 mm
Weight: Approximately 230g
Wiring: High-quality, flexible silicon wiring