Originally Posted by Newwt
Um yeah.. I have had this rig since 2011 and have never replaced the cmos battery
Heres the thing, motherboards in storage still have to store settings, the longer a system sits unused the more the battery is used. Ie if you use it every single day you're not going to have issues. If a moobo is stared for months before even being sold it drains the battery more then you think. Why do you think the first recommendation is to pull the CMOS battery, because it resets EVERYTHING.
Even a battery that shows 3v on a DMM might be lower then that under load, not low enough to cause issues every day but could happen every couple months. The batteries dont get charged so once they go they go.