B744 demand pumps on #2 and #3 for QF aircraft are electric. They run on a/c, a b1oody lot of a/c. Don't even begin to imagine that the ships battery would have the grunt to energise the relays, let alone turn the pumps (through an inverter of course!!)
As far as I know, min manoeuvre speed will windmill the engine fast enough to keep the flight controls working.