Tired of messy internal wiring or removing your guitar's entire control cavity plate just to swap out a dead battery? This genuine 9V battery compartment box is the ultimate clean-mount solution for active pickups and onboard preamp systems. Designed for flush, drop-in mounting directly into body routs. Built with durable ABS plastic and secure internal metal contact terminals, it ensures reliable power delivery and tight battery retention without annoying rattles (note: mounting screws are not included). Ideal for custom active bass builds, active humbucker guitar retrofits, or replacing damaged factory battery boxes on modern instruments.