CAUTION: Before performing these procedures, disconnect the modem from the telephone wall jack. If you remove the battery while the system is powered on and power cable is connected to an electrical outlet and then reinstall the battery and disconnect the power cable within one and a half seconds, the system may shut down.

NOTICE: Do not replace the battery with the computer in standby mode.

Ensure that the computer is turned off, set to the hibernate power management mode, or connected to an electrical outlet