Currently Being ModeratedApr 28, 2012 6:27 AM (in response to Chark Cole)
Never use a damaged battery. It may cause power and hardware issues for your Mac.
Use your Mac only when it's connected to a power source with the adapter connected to a wall outlet.
Currently Being ModeratedApr 28, 2012 7:22 AM (in response to Chark Cole)
There’s one problem with running your MacBook with the battery removed. MacBooks and MacBook Pros automatically reduce the processor speed by about half when the battery is removed.
If you have a MacBook with the removable battery you can get a new third party battery fairly cheap on eBay.
Or for $129 from Apple http://store.apple.com/us/product/MA566LL/A?mco=MTY3ODQ5OTY