Replacing the system battery:
Locate the battery socket. For more information, see the System board connectors section.
CAUTION To avoid damage to the battery connector, you must firmly support the connector while installing or removing a battery.
Place your finger between the securing tabs at the negative side of the battery connector, and lift the battery out of the socket.
To install a new system battery, hold the battery with the "+" facing up and slide it under the securing tabs.
Press the battery into the connector until it snaps into place.