The 
Nuprol Power 11.1v 1200mAh 20C LiPo
 battery is a slim stick-type airsoft battery with a small Tamiya connector
 
 
he key specifications are as follows: 
Type: LiPo (Lithium Polymer)
Voltage: 11.1V
Capacity: 1200mAh
Continuous Discharge Rate: 20C (at 24A)
Burst Discharge Rate: 40C (at 48A)
Configuration: Stick or Slim Stick
Connector: Small Tamiya (also referred to as Mini Tamiya)
Cell Count: 3S (3 cells)
Dimensions: Approximately 19 x 21 x 128 mm (some slim versions are 15 x 17 x 185 mm)
Weight: Approximately 115g 
Important Usage Information
Charger: LiPo batteries must be charged with a LiPo balance charger to prevent damage and ensure safety.
Safety: Always charge LiPo batteries in a fire-retardant safety bag and never leave them unattended during charging.
Compatibility: Ensure the dimensions (approx. 19 x 21 x 128 mm) fit the battery compartment of your airsoft replica before purchase.
AEG Compatibility: The high 11.1V output can cause pre-engagement issues in some AEGs (Airsoft Electric Guns) at UK power levels, which can damage internals. Only use this battery in AEGs specifically designed to handle 11.1V LiPo batteries.