Dell EMC PowerEdge R840 Installation and Service Manual
Replacing system battery
Prerequisites
WARNING There is a danger
of a new battery exploding if it is incorrectly installed. Replace
the battery only with the same or equivalent type recommended by the
manufacturer. For more information, see the safety information that
shipped with your system.
- Follow the safety guidelines listed in Safety instructions.
- Follow the procedure listed in Before working inside your system.
- Remove the air shroud.
- If applicable, disconnect the power or data cables from the expansion card riser x16 PCIe riser 2 or x8 PCIe riser 2.
- If installed, remove the expansion card risers.
- If installed, remove the PCIe expansion cards.
Steps
- Locate the battery socket. For
more information, see the System board jumpers and connectors section.CAUTION To avoid damage to the battery connector, you must firmly support the connector while installing or removing a battery.
- Use a plastic scribe to pry out the system battery.
Figure 1. Removing system battery 
- To install a new system battery, hold the battery with the positive side facing up and slide it under the securing tabs.
- Press the battery into the connector until it snaps into place.
Figure 2. Installing system battery 
Next steps
- If applicable, install the low profile PCIe cards.
- If applicable, install the expansion card riser x16 PCIe riser 2 or x8 PCIe riser 2.
- Connect the power or data cables to the expansion card risers.
- Install air shroud.
- Follow the procedure listed in After working inside your system.
- While booting, press F2 to enter the System Setup and ensure that the battery is operating properly.
- Enter the correct time and date in the System Setup Time and Date fields.
- Exit the System Setup.
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