Oh dear. I don't suppose you've got about £700 hanging around that you just couldn't work out what to do with? :frown:
Or being wildly optimistic you could try checking the battery box over for shorts.
I've had, and seen others have brand new batteries fail on a cold morning. Try warming the batteries up (in your pocket) and giving it a little time, and don't chuck the new ones that failed, they will probably be fine soon. And keep spare batteries in the house overnight.