System shows "Battery Critically low"

I am using Ubuntu 11.10 on VAIO . Whenever I unplug the charger from my laptop, there comes a dialog showing "battery critically low" and system suspends, even when the charge is 100%.


It is possible this is a bug. There are several bug reports filed reporting similar things. Check out here : https://bugs.launchpad.net/ubuntu/+source/upower/+bug/531190