This Dual Battery Plate from Teradek allows you to sandwich in your Bolt Pro 300, 500, 1000, 2000, or 3000 transmitter between your camera and two V-mount 14.4V batteries on both sides. It also offers one D-Tap accessory output (50W maximum) on the side.
Power pass-through plate
Three 1/4"-20 mounting points
Two 1/4"-20 pass-through slots
D-Tap output to power the receiver unit