Li-Polymer batteries are the newest available batteries for airsoft and other hobby toys. They are designed as a light weight, high output power source. This 11.1v Li-Po battery can deliver more power than 12v Ni-MH large type battery with only half of the size and a third of the battery cells.High capacity1600mahMini Tamiya connectorDimension103mm x 33mm x 6mm each cellWeight140g / 5oz Some compatible guns Special M4/16 "handguard rail" Full Stock full stock (M4/16, AK, M14, MP5,MKII ) Handguard ( G36 )RecommendedCheck dimensions of this pack to make sure it is similar to your current pack or fits in your battery compartment.NotePlease read instructions before using!