This 9.6v battery will provide a higher rate of fire compared to the 8.4v version.  This is your standard battery that will fit about 80% of airsoft guns including M4s, MP5s, M16s, and most other assault rifle type guns. This battery does not normally fit an AK style gun.

Airsoft guns G36C, M4A1-RIS, M4A1, CAR15, MP5A5, MC51, FNP90, AUGRT,AUGM, G3A4, G36, STEYR. For use in ERA002, ERA004, ERICS13, EROA002, EROA003, SDGE0507R2, SDGE0501R2, upgraded and/or modified AEGs.