IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

Checking the Battery Pack (2635-380/385)

•  Checking Operational Charging
•  Checking the Backup Battery

1.  Power off the computer
2.  Remove the battery pack and measure the voltage between  battery terminals 1 (+) and 4 (-).

    
   

   Terminal	Voltage (Vdc) / Signal
   1	+0 to +13.5
   2	N/C
   3	Thermal
   4	Ground (-)
   5	Select
   6	A-Ground

    

   NOTE: Signal lines not used in these steps are used for  communication between the system and the battery.

3.  If the voltage is less than +11.0 Vdc, the battery pack has been discharged.  Recharge the battery pack.
    If the voltage is still less than +11.0 Vdc after recharging, replace the battery.

   NOTE: If the voltage of the battery pack is 0 V, it is not defective.

4.  If the voltage is more than +11.0 Vdc, measure the resistance between battery terminals  3 and 4. The resistance must be 4 to 30 K ohm.
    If the resistance is not correct, replace the battery pack.
    If the resistance is correct, replace the subcard.

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