I have three year old Sony Vaio laptop that I use at work. The time in my BIOS moves back 4 to 5 mins after I reset the time. I first noticed that my Windows time, Windows 7 pro, was reverting back 4 to 5 mins after I would change it so I checked the BIOS time. Noticed that it was slow as well and made the change. Within 10mins of making the change my Windows and BIOS time had moved back 5 mins.
This isn't a huge deal, but it is kind of annoying. I am assuming it is a motherboard battery issue, or is that a poor assumption? If anyone has any thoughts would like to read them.