LOL, OK, in answer to silly question 1, no the pack was not balanced as it was charged as I don't have a balance charger.
Maybe that's the problem, one cell didn't take a charge....?
I'll borrow a balance charger tomorrow and balance the pack, hopefully that will solce the problem.

Silly question 2, the bird was perfect with the other pack, spot on.
I can't get my head around it, I have always used my trusty pro-peak constellation charger and it has never let me down.
May be it's time for somehting new.