Batteries duty cycle
Hi,
FlightPathOBN:
In regards to the batteries, in the fwd EE bay, it appears this is run like a UPS, where the power is constantly being drawn through the battery system, to provide a clean source for the avionics, else there would not have been an issue in-flight. IF that is the case, the batteries are in constant use.
In your model what is the function of the diode module?
IMO the MAIN and APU batteries are kept OFF LINE.
Exceptions (batt.):
MAIN: DC bus below ~30 V (including obviously, negative going spikes)
APU: APU start or towing lights consumption (with no APU)
(Most of use after you enter the plane and starts to use electricity, if no GPU and before APU)