Lenovo ThinkPad X131e Chromebook Hardware Maintenance Manual - Page 15

Checking operational charging, Checking the battery pack, resistance is not correct

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Checking operational charging To check whether the battery pack charges properly during operation, do the following: Note: Before you begin, install a discharged battery pack or a battery pack that has less than 50% of the total power remaining in the computer. 1. If the battery status indicator or icon does not turn on, remove the battery pack and let it return to room temperature. 2. Reinstall the battery pack. 3. If the battery status indicator still does not turn on, replace the battery pack. 4. If the battery indicator still does not turn on, replace the system board. Otherwise, refer to "Checking the battery pack" on page 9 to check the original battery pack. Checking the battery pack The battery status indicator is located in the lower-right corner of the screen. To view the percentage of battery power remaining, click the battery status icon. 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. Turn off the computer and disconnect the ac power adapter. 2. Remove the battery pack and measure the voltage between battery terminals 1 (+) and 7 (-). See the following table: Terminal 1 7 Voltage (V dc) + 0 to + 12.6 Ground (-) 3 4 5 6(-) 7(-) 2(+) 1(+) 3. Measure the resistance between battery terminals 5 and 7. The resistance should be 4 to 30 KΩ. If the resistance is not correct, replace the battery pack. 4. Depending on the voltage that you measure, do one of the following: • If the voltage is less than +11.0 V dc, recharge the battery pack. If the voltage is still less than +11.0 V dc after recharging, replace the battery pack. • If the voltage is more than +11.0 V dc, discharge the battery pack until the voltage becomes less than +11.0 V dc, and then recharge the battery pack. If the voltage still is less than +11 V dc after recharging, replace the battery pack. Note: Recharging will take at least three hours, even if the battery status indicator does not turn on. 5. Replace the system board if the new battery pack is not charged. Chapter 2. General checkout 9

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Checking operational charging
To check whether the battery pack charges properly during operation, do the following:
Note:
Before you begin, install a discharged battery pack or a battery pack that has less than 50% of the
total power remaining in the computer.
1. If the battery status indicator or icon does not turn on, remove the battery pack and let it return
to room temperature.
2. Reinstall the battery pack.
3. If the battery status indicator still does not turn on, replace the battery pack.
4. If the battery indicator still does not turn on, replace the system board. Otherwise, refer to “Checking
the battery pack” on page 9 to check the original battery pack.
Checking the battery pack
The battery status indicator is located in the lower-right corner of the screen. To view the percentage of
battery power remaining, click the battery status icon.
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. Turn off the computer and disconnect the ac power adapter.
2. Remove the battery pack and measure the voltage between battery terminals 1 (+) and 7 (-). See the
following table:
Terminal
Voltage (V dc)
1
+ 0 to + 12.6
7
Ground (-)
1(+)
2(+)
3
4
5
6(-)
7(-)
3. Measure the resistance between battery terminals 5 and 7. The resistance should be 4 to 30 KΩ. If the
resistance is not correct, replace the battery pack.
4. Depending on the voltage that you measure, do one of the following:
•
If the voltage is less than +11.0 V dc, recharge the battery pack. If the voltage is still less than +11.0 V
dc after recharging, replace the battery pack.
•
If the voltage is more than +11.0 V dc, discharge the battery pack until the voltage becomes less
than +11.0 V dc, and then recharge the battery pack. If the voltage still is less than +11 V dc after
recharging, replace the battery pack.
Note:
Recharging will take at least three hours, even if the battery status indicator does not turn on.
5. Replace the system board if the new battery pack is not charged.
Chapter 2
.
General checkout
9