How long is the runtime of the DJI RS 4 Pro battery grip?

The runtime of the DJI RS 4 Pro battery grip is 13 hours, when the gimbal is balanced in a level and stationary state, and the battery is powering only the gimbal.

When DJI RS 4 Pro is used with the new DJI RS BG70 High-Capacity Battery Grip, the battery runtime can be extended to 29 hours.