[ubuntu] Default battery indicator is showing whatever it wants

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http://ubuntuforums.org – Hi, I have Dell Ins 15R N5110 laptop. Beside unsolved problems like battery drainage in 90 mins, touchpad finger pressure, no multi-touch, no support for Nvidia card, etc etc , I have this another problem which is not less than headache, the default battery indicator shows anything for example when I unplug it , in 5 mins it shows less than 20min backup but I get 90 min backup. On battery, the information hugely fluctuates. Thanks for reply.. (Hardware)