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PC shuts down "critical battery" works fine on AC

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Suddenly, my PC will not run for more than five minutes or so on battery. It gives the "critical battery alarm" as if there was <3% charge and goes into hibernation when the battery is 90% charged. I tried getting a new battery, that has not helped.

I am running Windows XP on a Compaq Presario.

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Does the new battery do the same thing? If so sounds like the charging circuits are shot... does it work okay without the battery? if so you may either need to live with it... most likely the fix would be a motherboard replacement.... you could however go to the companies website to see if it's a known issue.... maybe your battery was recalled...
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