The Battery Slide Pro Gold Mount for Sony FX9 attaches to the rear of the camera and supports a Gold Mount battery, without blocking access to the FX9's standard battery compartment for an internal BPU battery. With an internal BPU battery installed, that dual access allows hot-swapping between the internal battery and the Gold Mount pack, so the camera keeps running through a battery change. The plate converts battery voltage to 19.5V and powers the FX9 through a barrel connector. Three D-Tap ports on the plate power accessories directly from the Gold Mount battery, and a protective digital fuse monitors those ports continuously, disabling them if the connected accessories draw more current than the set limit — without interrupting power to the camera itself. The rod-free rear slide position adjusts by loosening a thumbscrew and sliding. It shares this mounting, hot-swap and D-Tap layout with the V-Mount version of the Battery Slide Pro for the same camera, differing only in battery mount type.