Checking the Backup Battery (2635 380-385)

1.  Power off the computer and unplug the AC Adapter from the computer.
2.  Turn the computer upside down.
3.  Remove the DIMM cover and backup battery (see DIMM Card / Backup Battery)
4.  Measure the voltage of the backup battery.

   NOTE: Be careful not to measure the wrong side 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.