Testing the Backup Battery (8551)



Testing the Backup Battery
  1.  Place the computer bottom-side up.
  2.  Remove the bottom cover.
  3.  Disconnect the battery connector from the voltage converter.
  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 it is not, the backup battery is discharged by a short circuit or is defective.

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