[ubuntu netbook remix] Laptop and battery problems

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http://ubuntuforums.org – Sometimes when I pick up my laptop, it decides to stop the power supply running. It will just suddenly go black and not save my documents. When it happens, it makes a high pitch power down noise then just goes to black, where I then need to restart it. What could be the problem? Could my battery be loose? Also, my laptop says, "consider changing your battery". Is it broken? Or faulty? How do I keep a laptop battery in good condition? Should I buy one from http://www.batteriescenter.com.au (Hardware)