Dell OptiPlex 790 (Early 2011) - Manual (Page 32)

Installing The Coin-Cell Battery
1. Place the coin-cell battery into the slot on the system board.
2. Press the coin-cell battery downward until the release latch springs back
into place to secure it.
3. Install the heat sink .
4. Install the drive cage .
5. Install the front bezel .
6. Install the cover .
7. Follow the procedures in After Working Inside Your Computer .
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