"System Battery Voltage is low"

"System Battery Voltage is low" window pops up when a Dell desktop PC is being rebooted.  Options are F1 to continue and I believe F2 to go to settings.
What is the cause of this and should this be a concern?  If so, what do I do about it?
allmar7am7777Asked:
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rindiCommented:
The CMOS battery (a small battery that keeps the time and BIOS settings) needs to be replaced. This usually a small coin sized (cr2032) battery somewhere on the mainboard.
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allmar7am7777Author Commented:
is this easy to replace or do I need to have the tower taken into a computer store?
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rindiCommented:
It depends on the PC. But on most desktop PC's it's very easy. Just open the case, locate the battery on the mainboard, slip it out and replace it with the new one, making sure it is seated like it should be (+ at the right place and - at the right place).
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allmar7am7777Author Commented:
where do I get the replacement battery though?
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rindiCommented:
Probably in most supermarkets with electronic department, or at least in electronic or PC shops. Most PC's use the same battery (cr2032 like I mentioned above).
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