[ubuntu] General battery question - decreased capacity?

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http://ubuntuforums.org – Acer Aspire 4520 Ubuntu 11.04 Upgraded from Windows Vista My laptop lasts 1m30s after unplugging from AC power. It then throws itself into a seizure and shuts down. It says my battery is down to 30% capacity and that it may be old or broken, too. Just wondering, before I spend any money on a new battery, is this any kind of known glitch with switching out Vista for Ubuntu? I'm fairly sure there were no battery problems prior, but I'm not absolutely sure. Thanks! (Hardware)