Dell Latitude C640 - Manual (Page 36)

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Reserve Battery
Dell™ Latitude™ C540/C640 Service Manual
Removing the Reserve Battery
NOTICE: The reserve battery provides power to the computer's RTC and NVRAM when the computer is turned off.
Removing the battery causes the computer to lose the date and time information as well as all user-specified
parameters in the BIOS. If possible, copy the information before you remove the reserve battery.
NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed
batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on
the computer.
NOTICE: Read " Preparing to Work Inside the Computer " before performing the following procedure.
1. Remove the hard drive .
2. Remove the keyboard .
3. Disconnect the reserve battery cable from the reserve battery connector on the system board.
4. Pry the reserve battery free from the EMI shield. The reserve battery is attached to the EMI shield with a piece of
adhesive tape.
5. Remove any remnants of the adhesive tape from the EMI shield.
1 reserve battery