FAA Grounds 787s

[vaschandi]

The point of a battery is to provide short-term
electrical power when other sources of it are not available?

I would be not surprised if that is not the case for the 787!

I am sure you checked on Boeings´homepage their remarks about the
move from a hydraulic to an electrical brake system.

So may be one source of the multiple independant power distributions
to the brakes could be the battery itself.--For normal operation!