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How do I locate and change the CMOS battery in HP Compaq Presario 1234?

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It's easier than you think. Just go to the official webpage and grab the maintenance manual.
Here is the manual page.

Grab it and check the instructions. I tried to look into it, but I couldn't find the exact location of the battery in such a short time. However, I'm perfectly confident that you can find it with ease, if you expose the mainboard.

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The manual does NOT include anything about CMOS battery. It seems that "exposing the mainboard" requires brute force, and I am uncertain about that! – Lars Olle Persson Oct 30 '12 at 17:01

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