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
Hi Frederic --
My macbook 13" is doing the same exact thing as described by KPWKPWKPW. But, my question is, can I run the macbook just with the plug only -- without the battery? Between my iMac and iPad -- I don't use the MacBook that much anymore and don't know if it's worth it to buy a new battery unless I "NEED" to.
Thanks in advance for your help!
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.