This is the Hitec NiMH 4.8V 1600mAh RX Battery Pack.FEATURES: Flat pack with lime green shrink wrap and 22AWG lead wires with a Universal (servo type) connectorINCLUDES: One 4.8V 1600mAh flat battery packREQUIRES: NiMH compatible chargerSPECS: Length: 2-1/4" (57mm) Width: 1/2" (13mm) Height: 2" (51mm)COMMENTS: These are AA sized cells.HitecPart HRC54117