Return to MAIN-Index  Return to SUB-Index    IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

Checking the Battery Pack (2625)



Checking the Battery Pack

Battery charging will not start until the Fuel-Gauge shows that less than 90% of the total power remains; with this condition the battery pack will charge to 100% of its capacity. This protects the battery pack from being over-charged or having a shortened life.

Before you perform the following procedure, be sure you have the correct battery pack for this model.
  1.  Power-off the computer.
  2.  Remove the battery pack and measure the voltage between battery  terminals 2 (+) and 6 (-).  See the following figure.

     

  3.  If the voltage is less than +7.2 Vdc, the battery pack has  been discharged or is defective.  Recharge the battery.  If the recharging does not work,  go to Step 5 to check the charging circuit.

     If the voltage is still less than +7.2 Vdc after the recharging,  replace the battery.

  4.  If the voltage is more than +7.2 Vdc,  measure the resistance between  battery terminals 4 and 6.  The resistance must be 4K ohms to 30K ohms.

    If the resistance is not correct, replace the battery pack.

    If the resistance is correct, replace the DC/DC card.

  5.  To check the charging circuit, do the following.  Plug in the AC Adapter with the battery pack removed, then  power-on the computer.
  6.  Measure the charging voltage between DC/DC terminals  2 (+) and 6 (-).
  7.  If the voltage is less then +9.0 Vdc, replace the DC/DC card.  If the voltage is more than +9.0 Vdc, the charging circuit is  working correctly, replace the battery pack.

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