Checking Operational Charging
Note.
Battery charging will not start until the Fuel-Gauge
shows that less than 95% of the total power remains;
with this condition the battery pack will charge to
100% of its capacity. This restriction protects the
battery pack from being overcharged or from having a
shortened life.
To check operational charging, use a discharged battery
pack or a battery pack that has less than 50% of the total
power remaining when installed in the computer.
Power on the computer while it is connected to the AC
Adapter. If the battery status indicator does not turn on,
power off the computer, remove the battery pack and let
the battery pack return to room temperature. Reinstall the
battery pack, and power on the computer (still connected
to the AC Adapter). If the charge indicator still does not
turn on, the battery pack should be replaced.
Checking the Backup Battery
(Nonrechargeable)
1. Power off the computer and unplug the AC Adapter
from the computer.
2. Open the DIMM cover.
3. Remove the backup battery. (Refer to “1050 Backup
Battery or DIMM” on page 574 to remove the
battery.)
4. Measure the voltage of the backup battery connector.
See the following figure:
If the voltage is correct, replace the system board.
Wire Voltage (V dc)
Red +2.5 to +3.7
Black Ground
536 IBM Mobile Systems HMM
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