Currently Being ModeratedMay 19, 2012 9:56 AM (in response to CheyneFritts)Re: Vetta II Hd wont save
What he said.
It takes a standard CR2430 / BR2325 or equivalent 3V lithium coin cell type that is avaliable at many hardware stores, Radio Shack, etc.
It's not hard to do but the amp does need to be taken apart to access the battery which is on the main printed circuit board.
Luckly it should go for another 5 years or so before needing replacement.