Dell OptiPlex 755 User Manual page 26

1 system battery
2 positive side of battery connector
3 battery socket tab
4 battery socket
6. Install the new system battery.
a. Support the battery connector by pressing down firmly on the positive side of the connector.
b. Hold the battery with the "+" facing up, and slide it under the securing tabs at the positive side of the connector.
c. Press the battery straight down into the connector until it snaps into place.
7. Replace the computer cover (see
8. Enter system setup (see Entering System
9. Properly dispose of the old battery as described in the Product Information Guide.
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Replacing the Computer Cover).
Setup) and restore the settings you recorded in step 1.