Battery indicator(Battery not Present)

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http://askubuntu.com – I have installed Ubuntu 12.04 LTS as dual boot in my ACER ASPIRE 5745G laptop which has a WIN 7 Home Prem preinstalled in C: I have installed it from Windows 7 by using a Windows installer from the official Ubuntu download site. My Ubuntu has been installed in a separate partition of D: When I am using Ubuntu in battery, then though battery indicator is being shown at right top panel, but it's showing Battery not present. So I can't understand how much battery power is still there when using the battery, though when the power cord is on the battery is getting silently charged. Some more inform (HowTos)