Lenovo ThinkPad P50 Hardware Maintenance Manual page 34

1. Remove the battery pack. See "1010 Battery" on page 65.
2. Remove the coin-cell battery. See "1050 Coin-cell battery" on page 72.
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 P50 Hardware Maintenance Manual
Wire
Voltage (V dc)
Red +2.5 to +3.2
Black Ground