Lenovo 20QT, Hardware Maintenance Manual

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Ensure that you use the USB-C type ac power adapter that is shipped with the computer to provide enough
power to the computer. Otherwise, a message will be displayed, prompting you that the computer will not be
charged or will be charged slowly.
Checking the battery and operational charging
Checking the battery
This system supports only batteries specially designed for this specific system and manufactured by Lenovo
or an authorized builder. The system does not support unauthorized batteries or batteries designed for other
systems. If an unauthorized battery or a battery designed for another systems is installed, the system will not
charge.
Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and
provides no warranties for failures or damage arising out of their use.
Move your pointer to the battery-status icon in the Windows
®
notification area to check the battery status.
The battery-status icon displays the percentage of battery power remaining and how long you can use your
computer before you must charge the battery.
Checking the operational charging
To check whether the battery charges properly during operation, do the following:
1. Discharge the battery until the remained battery power is less than 50%.
2. Perform operational charging. Click the battery status icon in the Windows notification area to display
detailed battery information. If it indicates that the battery is not charging, replace the battery.
3. Check the battery status again. If the same error still exists, 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 62.
2. Remove the coin-cell battery. See “1130 System board assembly and side USB connectors” on page
77.
3. Measure the voltage of the coin-cell 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 coin-cell battery.
• If the coin-cell battery discharges quickly after replacement, replace the system board.
Chapter 3
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