Backup Battery Checkout - Nonrechargeable (TP 380XD, 385XD, 380Z - 2635)

1.  Turn off the computer and unplug the AC Adapter from the computer.
2.  Open the Memory-slot cover.
3.  Remove the Backup Battery (Refer to 'DIMM Card and Backup Battery' to remove the battery.)
4.  Measure the voltage of the backup battery connector.

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.