Dell Latitude C840 - Manual (Page 29)

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Reserve Battery
Dell™ Latitude™ C840 Service Manual
Removing the Reserve Battery
1. Follow the instructions in " Preparing to Work Inside the Computer ."
2. Remove the keyboard .
3. Remove the hinge cover .
4. Remove the display assembly .
5. Remove the palm rest .
6. On the underside of the palm rest, disconnect the palm-rest flex cable from the ZIF connector.
NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.
1 palm rest bracket
2 reserve battery
3 reserve battery cable
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 NVRAM. If possible, copy the information before you remove
the reserve battery.