It seems the alert isn't always right, though, and Microsoft says it's related to the way Windows 7 reads system firmware. The issue dates back several months, and many claim it began when they switched from the RC to RTM or retail editions of Windows 7. Along with the prompt, users say their battery life has been halved or worse, and at least one person purchased a new battery, but the issue remained.
Despite the bug, if you upgrade to Windows 7 and receive the warning it could still be legitimate, and Microsoft will help you determine if that's the case.
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