It appears that US Airways aren't brave enough to publicly state that crews who decided not to accept this aircraft were out of line and pointlessly over cautious. I wonder why? As an organisation they will have to accept that every now and again crews may refuse to take an aircraft which may be legal to dispatch but in the crew's opinion, unwise. But that's what you pay captains for. But as ever, I'm sure there's more this story than meets the eye especially as it looks like the aircraft returned to the gate. Personally, I wouldn't like to take an electric aircraft which had just had suffered multiple supply failures without a good explanation from an engineer or Technical Pilot.
PM