On Jan 10, 3:14*pm, Gig 601XL Builder
wrote:

Now for the guys with "Heavy" experience. Does the 747 really only have
enough onboard battery power to last a little over an hour for the
flight deck?- Hide quoted text -

- Show quoted text -

About an hour depending on the model, BUT, they can just start the APU
and this would run at least one of the main busses.
Frank