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An airsoft battery box is an external enclosure, often styled to resemble real weapon accessories like PEQ laser modules or AN/PEQ-15 units, designed to house and conceal the battery that powers an airsoft gun—especially on models with limited internal battery space. It mounts to the gun’s rail system, providing both extra room for larger batteries and a realistic tactical appearance. Airsoft battery boxes are popular for their practicality, allowing longer play times with bigger batteries and maintaining the authentic look of the replica firearm.