Checking The Coin-Cell Battery - Lenovo ThinkPad L13 2-in-1 Gen 5 Hardware Maintenance Manual

Step 2. Connect the computer to ac power to charge the battery. If the battery status icon in the Windows
notification area indicates that the battery is not charging, remove the battery and let it return to
room temperature.
Step 3. Reinstall the battery. If the battery is still not charging, replace the battery.
Step 4. Check the battery status icon 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:
Step 1. Power off the computer, and unplug the ac power adapter from it.
Step 2. Turn the computer upside down.
Step 3. Remove the built-in battery. See "Disabling the built-in battery" on page 61.
Step 4. Remove the coin-cell battery. See "Coin-cell battery" on page 75.
Step 5. Measure the voltage of the battery. See the following figure.
• 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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ThinkPad L13 Gen 5,ThinkPad L13 2-in-1 Gen 5 and ThinkPad S2 Gen 9 Hardware Maintenance Manual
Wire
Red
Black
Voltage (V dc)
+2.5 to +3.2
Ground