For computers shipped without optical drive
- Disconnect the coin-cell battery cable from the I/O board.
- Peel the coin-cell battery cable from the palm rest and keyboard assembly.
CAUTION: : Removing the coin-cell battery resets the BIOS setup program’s settings to default. Before removing the coin-cell battery, it is recommended to note the BIOS setup program’s settings.
Using a plastic scribe, gently pry the coin-cell battery out of the battery socket on the I/O board.