I have an 80GB iPod classic. It's out of warranty. The battery will not hold a charge, this would be ok because I only use it in the car, where it's plugged in. The scroll wheel is also a little fussy, but works for the most part UNTIL you plug it in to a power source of any kind, when it does not function at all. So you can see my catch 22. Should I spend any money on this thing? Replace the scroll wheel? Battery? I'd rather just bury it than replace both components it seems...thoughts?