Welcome to the Dell Community  @frozensun 

Dell OptiPlex 9010/7010 Small Form Factor Owner's Manual:

https://downloads.dell.com/manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-9010_owner%27s%20manual3_en-us.pdf

WOW!  As U2CAMEB4ME advised... go to the link he provided and at page 21... your step-by-step instructions are there.

A  

Hmm,there is no way I can reach the cmos battery without removing the gpu.

And in the manual it's really bad explanation I can't understand.

How do I lift the battery up,with screwdriver?

@frozensun 

We use plastic scribes but in a pinch a "Chop Stick" will work.

The battery should move from side to side just a little bit.

Move to one side and lift.

I will check in the AM if I have a 9010 to look at.

Regards,

U2

I need to remove graphics card first so I can reach tbe battery.

But there is a blue plastic retention clip holding it.

How do I remove graphics card?

[URL=http://www.imagebam.com/image/17a0d71247348524][IMG]http://thumbs2.imagebam.com/97/57/fe/17a0d71247348524.jpg[/IMG][/URL] [URL=http://www.imagebam.com/image/e6caa11247349014][IMG]http://thumbs2.imagebam.com/02/fb/f6/e6caa11247349014.jpg[/IMG][/URL] [URL=http://www.imagebam.com/image/d78ee41247349704][IMG]http://thumbs2.imagebam.com/38/10/88/d78ee41247349704.jpg[/IMG][/URL]

@frozensun 

Move the Blue Tab towards the battery and lift.

My 3040 only has 1 slot but is the same.

Regards,

U2

@frozensun 

From your images it looks like you need to slide the battery to the left then lift.

Regards,

U2

You remove the cover and its right there by the slots.

Use plastic Spudger to press the latch and it pops out.

Dell F3KHR OptiPlex 9010 Small Form Factor SFF

https://www.amazon.com/Syntus-Precision-Screwdriver-Professional-Electronics/dp/B075F4RFM2/

The Pointy Blue plastic Spudger press the latch.

DO NOT USE METAL TOOL

Chopstick or BIC Pen TAB

Latch holds battery in.

Duracell DL2032 battery