Dell Inspiron 1521 (Mid 2007) - Manual (Page 167)

Adding and Replacing Parts
167
Removing the Coin-Cell Battery
1 Follow the procedures in "Before You Begin" on page 141.
2 Turn the computer over.
3 Loosen the captive screw on the memory module/coin-cell battery cover
(see "Bottom View" on page 30), and remove the cover.
4 Disconnect the coin-cell battery cable from the system board.
5 Slide the battery out of the mylar sleeve.
Replacing the Coin-Cell Battery
1 Connect the coin-cell battery cable to the system board.
2 Slide the coin-cell battery into the mylar sleeve.
3 Replace the cover and tighten the captive screw.
1 coin-cell battery 2 mylar sleeve
3 battery cable connector
2 1 3