As airplanes generate their own electricity with engines switched on, the battery should not be discharging. In fact, the battery should be charging with engines on. When engines are switched off power can be consumed from the battery.
As airplanes generate their own electricity with engines switched on, the battery should not be discharging. In fact, the battery should be charging with engines on. When engines are switched off power can be consumed from the battery.
About 180 kW electric power output by GE-90
https://www.easa.europa.eu/en/downloads/7799/en