a 'dead battery' = ('Brit') a 'flat battery' [=a battery that has no more electricity]
The operation was performed by a 'battery' of doctors.
He was found guilty of 'battery'.
(..) You... you have, you have lots of Talents, uh... Special talents in fact, like Um, uh... Special talents? You changed the batteries in the smoke detector. You sure did... aaa's. And in six months, you'll have to check 'em again... Won't he? (..)2003 Elf