Originally Posted by ManaAdaSystem
Quote:
I am well aware of that, and I am also aware of the fact that the airplane batteries are normally not used when AC power is supplied.
But that doesn't mean the batteries are not charged in flight.
My understanding is that the battery is only charged when it has been discharged. If the battery is fully charged and is not discharging (primarily because the a/c has sufficient power from other sources) then the battery will retain its fully charged state until it is required.