The computer clock is inaccurate.
The computer clock is inaccurate.
Details depend on the motherboard model. Generally—it's straightforward, even my sons could handle it and they're not very tech-savvy. If you prefer instructions in text form: http://www.computerhope.com/issues/ch000239.htm. I think they emphasize the need for a backup battery setup, but that’s just my note. Personally, I’d keep a digital photo of the battery orientation and record how it was placed beforehand so I can match it correctly later.