My trackpad only works when the battery of my macbook is less of 30%

idk what is goiing on, i installed mavericks and my macbook stared to fail, i cant even see much of the aplications icons or folders :/ what should i do?

Swollen batteries sometimes cause the trackpad to malfunction.
Your appointment at the genius Bar at an Apple Store is FREE, in warranty or out, and you are under no obligation to have them do any work for a fee.
These guys put their hands on these machines all day every day, and they are good at Power problems and Physical problems.

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