I recently purchased a used Lenovo Thinkstation E32 computer. I always update the BIOS when I get a new machine — here is how to do it using a bootable USB stick. No Windows required.
Replacing the OptiPlex 9010 SFF CMOS battery
I have two Dell OptiPlex 9010 SFF computers, and one of them have been unused and unplugged for a long time. So long in fact that the CMOS battery is now dead. But replacing it was simple.