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# Reserve Battery

Dell™ Latitude™ C840 Service Manual

| 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.

### 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.

1 | M2.5 x 4-mm screws (4)
2 | palm rest bracket
3 | palm-rest flex cable

1. Remove the four M2.5 x 4-mm screws that secure the palm rest bracket.
2. While supporting the palm-rest flex cable, lift out the palm rest bracket and turn it over.
3. Disconnect the reserve battery cable.
4. Remove the reserve battery:
   1. Pry the reserve battery free from the metal palm rest bracket.
   1. Remove the foam-pad remnants from the palm rest bracket.

### Replacing the Reserve Battery

1. Seat the reserve battery and press it into place.
2. Connect the reserve battery cable.
3. Place the palm rest bracket loosely in the palm rest, and connect the palm-rest flex cable to the ZIF connector.
4. Replace the four M2.5 x 4-mm screws that secure the palm rest bracket to the palm rest.

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