Change the CMOS battery
Change the CMOS battery
Ensuring the PSU remains active (without PC setup) should supply energy to the motherboard and let you replace the battery seamlessly.
I thought about it, but as a beginner I worried about accessing the system while it's powered on. Thanks for clarifying, it really helped.
Typically it takes 4 to 10 minutes for the mobo to refresh all settings without a CMOS and PSU. Occasionally it may be quicker. If you're worried about resetting everything (CMOS reset phobia), you can ask someone else. When you remove the battery, they can quickly replace it with another fast.
It isn't as complicated as you think about the BIOS updates... many now let you save changes as presets for later use. For most people, it stays on the standard settings—like enabling XMP, choosing the boot device, adjusting boot priority, or setting a specific fan curve. If the system still gets 5V standby power (even if the supply is off but not unplugged or switched off), the time and CMOS data will remain intact. This means you can swap the battery without losing anything. Swapping is straightforward: on most connectors, just press a clip on the side and the battery comes out. I use a flathead screwdriver to gently push between the metal part and the battery. Without power from the 5V standby circuit, the settings will disappear within seconds after removing the battery. The battery itself is 3V with very low current—just a few milliamps continuously—so it can't damage components like a CR2032.
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