Checking the Backup Battery

1.  Power-off the computer and unplug the AC Adapter  from the computer.
2.  Open the keyboard, and remove the battery pack.
3.  Remove the backup battery from the shield assembly.
4.  Measure the voltage of the backup battery.

Wire	Voltage (Vdc)
Red	+2.5 to +3.7
Black	Ground

•  If the voltage is correct, replace the system board.
•  If the voltage is not correct, the backup battery has been  discharged. Replace the backup battery.
•  If the backup battery discharges quickly after replacement,  replace the system board.