Even with electric_always_available = 1 in the .cfg, I'm losing power to radios after about 6 minutes, with APU running. Also when this happens the radio frequencies won't dial, and engines won't start. Amps/volts still look okay, and everything appears to be on but if I shut off the APU generators I can see the Battery is dead.

My APU start precedure:

battery on
hydr B pumps off
DC selector to Batt
Iso valve to auto
#1 fuel pump on
APU start, stabilized
APU gen switches on ***see note below***
apu bleed open
AC selector to APU
position lights on
#1 pack on after 1 minute

I notice when I switch ONE apu generator switch to ON, both "bus off" lights extinguish, instead of only the one relative to each generator switch. Not sure how important that is or not.