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.
![](https://blog.cavelab.dev/2021/01/optiplex-9010-sff-cmos-battery/20210107_141907_hu02eb4276b7c5348bc9b27aeb2bbd5b34_638482_800x0_resize_q80_lanczos.jpg)
The battery is a CR2032 and is located right next to the first PCI express port, if you have a card there you will need to remove it to get access.
A simple push on the handle and the battery popped out.
![](https://blog.cavelab.dev/2021/01/optiplex-9010-sff-cmos-battery/20210107_141949_hu69760f1968e51ce444b751fa0a486d02_659618_800x0_resize_q80_lanczos.jpg)
I turned the computer off, and unplugged it for a few minutes… No warnings when powering it back up, success! 🥳
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