ORIGINAL: MinnFlyer
If this is a 7 cell pack, I would assume that it not a receiver pack, but a Motor pack. If this is correct, don't worry about replacing one cell. If another goes bad, you're not going to lose your plane.
To summerize: If this is just a pack for an electric motor, I would replace just the one cell.
Roger that.
As I was tryin' to say, not everyone-especially newbies, have the bucks to "just buy" a new pack or whatever. It's good to be a little thrifty, and learn/know how to change things.
Not insinuating anyone "risk 300-3000 bucks to save 20-30."
How rediculous is that?
Jetts