I've said this multiple times....the battery life on the iphone 5 is pretty bad if you're in a bad signal area and try to actually connect...the phone consntatly searches for a signal and wastes power that way. iLounge had a post about this specific issue. I'm assuming this can be fixed with a software release.
I've found my battery to meet apple's specs when I'm in a good service area or home on wifi with location services on and push email on.
I've found my battery to meet apple's specs when I'm in a good service area or home on wifi with location services on and push email on.