Markoz wrote on May 7^th, 2012 at 9:13am:

These two: DC Meters - on BAT, positive indication on DC Amps. DC Meters - on BAT, negative indication shown on DC Amps. are interesting. I too thought the opposite would apply. A bug maybe?

Yeah, that's what I'm thinking.  I'm wondering if the battery is draining instead of charging when you connect external power or the APU.

One thing I just thought to test...  Just turn on the battery, switch standby power to BAT, then start turning things on and see if the battery drains.  If the DC Amps meter is correct, maybe it will not drain.  That would be fun and real handy in an emergency!