Lenovo ThinkPad T430s Hardware Maintenance Manual - ThinkPad T430s and T430si - Page 38

Checking the backup battery, Remove the battery pack. See 1010 Battery pack - ac adapter

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To check the battery pack, do the following: 1. Power off the computer. 2. Remove the battery pack and measure the voltage between battery terminals 1 (+) and 7 (-). See the following illustration: 3 4 5 6(-) 7(-) 2(+) 1(+) Terminal 1 7 Voltage (V dc) + 0 to + 12.6 Ground (-) 3. If the voltage is less than +11.0 V dc, the battery pack has been discharged. Note: Recharging will take at least 3 hours, even if the indicator does not turn on. If the voltage is still less than +11.0 V dc after recharging, replace the battery. 4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 5 and 7. The resistance must be 4 to 30 K Ω. 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 60. 4. Remove the backup battery. See "1090 Backup battery" on page 80. 5. Measure the voltage of the backup battery. See the following illustration. Wire Red Black Voltage (V dc) +2.5 to +3.2 Ground • If the voltage is correct, replace the system board. • If the voltage is not correct, replace the backup battery. • If the backup battery discharges quickly after replacement, replace the system board. 32 Hardware Maintenance Manual

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To check the battery pack, do the following:
1. Power off the computer.
2. Remove the battery pack and measure the voltage between battery terminals 1 (+) and 7 (-). See the
following illustration:
Terminal
Voltage (V dc)
1
+ 0 to + 12.6
7
Ground (-)
1(+)
2(+)
3
4
5
6(-)
7(-)
3. If the voltage is less than +11.0 V dc, the battery pack has been discharged.
Note:
Recharging will take at least 3 hours, even if the indicator does not turn on.
If the voltage is still less than +11.0 V dc after recharging, replace the battery.
4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 5 and 7.
The resistance must be 4 to 30 K Ω. 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 60.
4. Remove the backup battery. See “1090 Backup battery” on page 80.
5. Measure the voltage of the backup battery. See the following illustration.
Wire
Voltage (V dc)
Red
+2.5 to +3.2
Black
Ground
•
If the voltage is correct, replace the system board.
•
If the voltage is not correct, replace the backup battery.
•
If the backup battery discharges quickly after replacement, replace the system board.
32
Hardware Maintenance Manual