The 
Nuprol Power Extreme LiPo Battery Deans 3300mAh 11.1v 30c triple stick
 (also referred to as a nunchuck or tri-leg configuration) is a high-capacity lithium-polymer battery designed primarily for high-performance airsoft guns
 
Product Specifications
 the specifications are as follows: 
Type: LiPo (Lithium Polymer)
Voltage: 11.1v (3S configuration, 3 cells)
Capacity: 3300 mAh
Continuous Discharge Rate: 30C (99A, according to Amazon UK; 43A, according to Land Warrior Sports)
Burst Discharge Rate: 60C (198A, according to Amazon UK; 87A, according to Land Warrior Sports)
Connector: Deans (T-Connector)
Configuration: Triple Stick / Nunchuck (three splits to fit various compartments)
Dimensions (each stick): Approximately 13 x 21 x 128 mm
Weight: Approximately 270 grams 
 
Compatibility and Usage
Airsoft Replicas: This battery is suitable for rear-wired airsoft replicas where the buffer tube is not hollow, or front-wired replicas with space in the handguard/barrel area. Its triple stick design helps it fit into small or irregularly shaped battery compartments.
Charging: It must be charged with a LiPo balance charger only. It should always be charged in a fire-retardant safe-charging bag.
Performance: LiPo batteries offer an excellent capacity-to-size ratio and can be frequently recharged without a "memory effect", though they should not be fully discharged below 3V per cell.