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Checking the Battery Pack
1. Power off the computer.
2. Remove the battery pack and measure the voltage
between battery terminals 1 (+) and 4 (−). See the
following figure.
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 V dc, the battery pack
has been discharged. Recharge the battery pack.
If the voltage is still less than +11.0 V dc 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 V dc, 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.
Checking the Backup Battery
1. Power off the computer and unplug the AC Adapter
from the computer.
2. Turn the computer upside down.
3. Remove the DIMM cover and backup battery (see
“1020 DIMM Card / Backup Battery” on page 218).
Terminal Voltage (V dc) / Signal
1 +0 to +13.5
2 N/C
3 Thermal
4 Ground (−)
5 Select
6 A-Ground
ThinkPad 380, 380D, 385, 385D (2635) 195