IndiPro Tools SLSBM4K is Sony L-Series Battery Adapter Plate from IndiPRO Tools using an L-series battery, for use with Blackmagic Design Pocket Cinema Camera 6K or 4K. The L-series battery plate features a coiled cable that extends from 18 to 32", and it has a 2-pin connector at the other end that provides 12V output your camera.
The battery plate is mounted onto a metal plate with a 1/4"-20 mounting thread and screw, allowing you to use a variety of mounting adapters, cages, or accessory arms. The plate also features a 2.1mm barrel coax output that provides 7.2V power output to additional accessories.