Dell OptiPlex Small Form Factor 7020 Owner's Manual page 41

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Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following images indicate the location of the coin-cell battery and provide a visual representation of the installation
procedure.
Figure 6. Installing the coin-cell battery
Steps
With the positive side (+) facing up, insert the coin-cell battery into the battery socket (RTC) on the system board and snap the
battery in place.
Next steps
1. Install the side cover.
2. Follow the procedure in After working inside your computer.
Removing and installing coin-cell battery 41