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This video will guide you through the process of replacing the CMOS Battery for your IBM Thinkpad T42
The replacement cost of the battery was approximately $5 CDN
You might want to take note of the location of your existing CMOS battery and how it is secured inside before removing it so you can be sure to install and secure the new battery in the same manner.
Also just a word of caution when lifting the back panel to ensure you don't disconnect the ribbon cable for the touchpad otherwise you will need to reconnect it. This happened to me when I replaced the battery and it wasn't until I restarted the laptop that I discovered my touchpad was not functioning properly and I discovered that I had accidentally disconnected the touchpad ribbon cable. After reconnecting the ribbon cable the touchpad worked again.