Lenovo ThinkPad 380ED HMM ThinkPad 380XD,385XD (May 1998) - Page 39

Backup Battery Checkout, Nonrechargeable, Checking Operational Charging

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4. If the voltage is more than +11.0 V dc, measure the resistance between the battery terminals 3 and 4. The resistance must be 4 to 30 K ohms. If the resistance is not correct, replace the battery. If the resistance is correct, replace the DC/DC card. Checking Operational Charging Note Battery charging will not start unless the Fuel-Gauge is below 95%. At below 95%, the battery will start charging to 100% of its capacity. This limitation protects the battery from overcharging and also prolongs its life. To check the operational charging, install a fully discharged battery or a battery that is less than 50% charged. Turn on the computer while it is connected to the AC Adapter. If the battery status indicator does not turn on, turn off the computer, remove the battery, and let the battery return to room temperature. Reinstall the battery, and turn on the computer (still connected to the AC Adapter). If the charge indicator still does not turn on, replace the battery. Backup Battery Checkout (Nonrechargeable) 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 "1010 DIMM Card and Backup Battery" on page 62 to remove the battery.) 4. Measure the voltage of the backup battery connector. Wire Red Black Voltage (V dc) +2.5 to +3.7 Ground IBM ThinkPad 380XD, 385XD (2635) 31

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4.
If the voltage is more than
+
11.0 V dc, measure the
resistance between the battery terminals 3 and 4.
The resistance must be 4 to 30 K ohms.
If the resistance is not correct, replace the battery.
If the resistance is correct, replace the DC/DC card.
Checking Operational Charging
Note
Battery charging will not start unless the Fuel-Gauge
is below 95%.
At below 95%, the battery will start
charging to 100% of its capacity.
This limitation
protects the battery from overcharging and also
prolongs its life.
To check the operational charging, install a fully
discharged battery or a battery that is less than 50%
charged.
Turn on the computer while it is connected to the AC
Adapter.
If the battery status indicator does not turn on,
turn off the computer, remove the battery, and let the
battery return to room temperature.
Reinstall the battery,
and turn on the computer (still connected to the AC
Adapter).
If the charge indicator still does not turn on,
replace the battery.
Backup Battery Checkout
(Nonrechargeable)
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 “1010
DIMM
Card and Backup Battery” on page
62 to remove the
battery.)
4.
Measure the voltage of the backup battery connector.
Wire
Voltage (V dc)
Red
+
2.5 to
+
3.7
Black
Ground
IBM ThinkPad 380XD, 385XD (2635)
31