Dell OptiPlex 755 - Manual (Page 26)

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 Replacing the Computer Cover ).
8. Enter system setup (see Entering System Setup ) and restore the settings you recorded in step 1 .
9. Properly dispose of the old battery as described in the Product Information Guide.
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1 system battery
2 positive side of battery connector
3 battery socket tab
4 battery socket