Deity SPD-T4BATT TA4f to Smart Battery Cup

The SPD-T4BATT runs a 2054-style smart battery into a TA4f-powered device. What separates it from a plain power cable is the data: cell telemetry travels with the power, so the recorder reads the pack's remaining capacity instead of showing a bare voltage that tells you nothing until it is already too late.

That matters in a bag, where the pack is buried and swapping it is a scene-ending interruption. Wire it once and battery state becomes something you can see on the device you are already looking at.