System Battery Voltage Low

When I first power up my pc (a dell dimension 8300) (Win XP Pro) I get the following message:

Alert! System Battery Voltage is Low; press F1 to conitnue; F2 to run set-up utilitly.

Then I hit F1 and everything loads correctly. Do I need to replace some kind of battery? Any ideas? Help:)

-Guru
 
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