The IndiPRO Tools Power Grid System with 2x LP-E6 Batteries for Blackmagic Pocket Camera Kit from B&H combines an external battery power system with two LP-E6 batteries for powering the Blackmagic Pocket Camera.
The Power Grid System attaches to your rig via a 15mm rod clamp and neatly plugs into the camera with a right-angle connector. The two LP-E6 batteries snap in on the sides and together supply the necessary voltage to the camera. If the camera's internal battery has any power left, you'll be able to hot swap the LP-E6 batteries with additional ones without powering the camera down. The batteries each feature a 7.4V output and 1750mAh capacity.