The Power Brick Mini provides the Pixhawk 2.1 with the needed voltage and also the current measurement aswell as the voltage metering.
Technical Data
Maximum Inputvoltage: 8S Lipo (29,6V)
Power consumption: 30A
Peak current: 100A
Plug system: XT-60
Weight: 14g
Dimensions: 53 x 18 x 14mm
Scope of delivery
1 x ProfiCNC Power Brick Mini