Focus 7, Focus 7 Bolt 500 RX TX – SmallHD – Software feature – Explanation of Dual Battery drain
Monitor cannot power camera for very long.
Simultaneous Battery Drain. In the power settings menu, an option named “DUAL BATTERY DRAIN” will cause both batteries to be drained simultaneously. This will keep the output voltage as high as possible and extend the duration we can power a camera. Available on monitors with DC out jacks & multiple battery slots.
Enable or Disable by going to Settings->User->Power.
The voltage will slowly drop as the batteries drain.
Dual battery drain, hot swap, powering camera