Checking The Coin-Cell Battery - Lenovo ThinkPad X240 Hardware Maintenance Manual
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Also See for ThinkPad X240:
- User manual (181 pages) ,
- Hardware maintenance manual (112 pages) ,
- Specifications (4 pages)
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Note: If the battery pack becomes hot, it may not be able to charge. Remove it from the computer and leave
it at room temperature for a while. After it cools down, reinstall and recharge it.
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 figure:
1(+)
3. If the voltage is less than +11.0 V dc, the battery pack has been discharged.
If the voltage is still less than +11.0 V dc after recharging, replace the battery pack.
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 coin-cell battery
To check the coin-cell battery, do the following:
1. Disable the built-in battery. See "Disabling the built-in battery" on page 58.
2. Remove the coin-cell battery. See "1110 Coin-cell battery" on page 73.
3. Measure the voltage of the coin-cell battery.
• If the voltage is correct, replace the system board.
• If the voltage is not correct, replace the coin-cell battery.
• If the coin-cell battery discharges quickly after replacement, replace the system board.
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Hardware Maintenance Manual
7(-)
6(-)
5
3 4
2(+)
Terminal
Voltage (V dc)
1, 2
+ 0 to + 12.6
6, 7
Ground (-)
Wire
Voltage (V dc)
Red
+2.5 to +3.2
Black
Ground
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