Checkout guide
for Nickel metal hydride battery;
vIf the voltage is more than +8.0 V dc, measure the resistance between battery terminals 4 and 5. 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 system board.
Checking the backup battery
Do the following:
1.Power off the computer, and unplug the ac adapter from it.
2.Turn the computer upside down.
3.Remove the battery pack (see “1010 Battery pack” on page 51).
4.Remove the backup battery (see “Checking the battery pack” on page 31).
5.Measure the voltage of the backup battery. See the following figure.
Wire | Voltage (V dc) |
|
|
Red | +2.5 to +3.2 |
|
|
Black | Ground |
|
|
vIf the voltage is correct, replace the system board.
vIf the voltage is not correct, replace the backup battery.
vIf the backup battery discharges quickly after replacement, replace the system board.
32ThinkPad A21e
