laptop batt problem

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I have a Dell Latitude C810 & with both the batt & ac connected works well.
when I unplugg my ac it immediately goes to batt power w/o shutting down,
but when the batt indicates its getting low I plug the AC back in and the
icon on the bottom will not switch back to AC power and eventually when the
batt goes dead the computer shuts down.  I thne reboot and its all ok under
AC power in the lower right screen area. Why can I go from ac to batt w/o
shutting down but not from Batt to AC?  I am using Windows XP and hv 512MB

Do I need a new patch or what?

Re: laptop batt problem

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Why not try running on batteries for a few minutes, then switch back to
mains long before the battery is low. Give it a few seconds, then physically
remove the battery and see what the computer does. If it continues to
operate, then the mains is working fine, if not then perhaps something has
failed in the charging or power circuits in the PC. If the computer
immediately goes off, then there is a problem in the power supply or power
circuits of the PC. If the laptop continues to run (on mains), then you have
a software problem.

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