Computer CMOS information
CMOS is an on-board semiconductor chip powered by a CMOS battery inside IBM compatible computers that stores information such as the system time
How to replace the CMOS battery.
Information about why time may be lost or decreasing rapidly and how to replace your computer cmos battery
Computer Battery Help
The first type of battery is the backup battery, which is commonly referred to as the "CMOS battery".
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I had the same problem. I had to *completely* disassemble the notebook to find the rechargeable Maxell button cell on the upper side of the main board. (Sorry, I can't remember the type at the moment!) The button cell is in a little carrier/holder which is surface mounted and I also found that one of the connections had broken, probably due to thermal expansion from the heat generated from the CPU. That requires extra soldering skills to repair, since the pads are very small and not easy to reach, and it is so easy to damage. Disassembly is complicated and it is very easy to damage or lose something if one is not very, very careful. For example, it is very easy to break the touchpad wiring and connector without even knowing it.
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