Dell LATITUDE D400 - Manual (Page 37)

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Reserve Battery
1. Follow the instructions in " Preparing to Work Inside the Computer " to remove the main battery and prepare the computer for work.
2. Remove any installed memory modules , smart card, modem , or PC Card.
3. Remove the keyboard .
4. Remove the display .
5. Remove the palm rest .
6. Lift out the reserve battery, and disconnect it from the system board connector.
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CAUTION: Before performing the following procedures, read the safety instructions in your System Information Guide.
NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such
as the back panel) on the computer.
NOTICE: Note the reserve battery location before you remove it so that you can put the replacement reserve battery in the same location.
1 reserve battery 3U490
2 system board connector