The issue is with the power level display only. The camera will continue to get power from the Relay as long as the Relay is charged and connected to an external power supply. The Relay Coupler is not relaying the correct power levels to the Sony A7II family of cameras as the power decreases. Initially, it reads properly, but the power meter will keep decreasing no matter if the Relay is charging. If the power meter on the camera decreases to 0%, the Relay will still power the camera. You will need to monitor power levels using the Case Relay LED and external battery.
If you turn the camera off and reconnect the Relay, the power percentage indicator will go back to the true level then decrease again. This does not affect the first generation of A7.