An AEG (Automatic Electric Gun) is battery powered. There are multiple batteries used in airsoft guns, and they all have different ranges in voltage output and capacities. We offer Li-Po (Lithium) and LiFePO batteries. Your selection of battery affects performance of your gun. Battery chargers can be standard wall types to high end smart chargers. A good quality charger is a great complement to a good quality battery. Smart chargers are designed to recharge a battery to the maximum capacity. Practice targets can improve your shooting accuracy. With Modify BULL