For owners of airsoft electric guns and pistols, airsoft battery packs is the energy source that makes your semi and fully automatic guns possible. The quality of an battery will affect the performance and number of shots per charge.Whether you need a replacement, spare, or upgrade, airsoft batteries are available for just that and come in many shapes, sizes, voltages, capacities, and connectors, so be sure to choose the right airsoft battery for your airsoft gun. The shape of an airsoft battery will depend on where you battery is stored in the airsoft gun and will require different shapes to fit such as brick types, stick types, butterfly/nunchuck types, and etc. The voltage of an airsoft battery will give you an idea of the power of the battery giving you an increase rate of fire as you go up. While the amperages, usually designated as maH, is the capacity of the battery. The larger the number, the larger charge it can hold, and the longer it will last. It is also recommended that a smart charger also be purchased to ensure a fast proper charge and long-lasting battery life.