Lenovo 21FV Hardware Maintenance Manual page 34

2. Remove the coin-cell battery. See "1150 System board (for models with hybrid graphics only)" on page
79.
3. Measure the voltage of the coin-cell battery. See the following illustration.
• 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 P1 Gen 6 Hardware Maintenance Manual
Wire
Red
Black
Voltage (V dc)
+2.5 to +3.2
Ground