Checking The Coin-Cell Battery - Lenovo ThinkPad P40 Yoga Hardware Maintenance Manual

Checking the coin-cell battery

To check the coin-cell battery, do the following:
1. Disconnect the battery connector. See "Disabling the built-in battery" on page 68.
2. Remove the coin-cell battery. See "1070 Coin-cell battery" on page 78.
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 P40 Yoga, S3, ThinkPad Yoga 14, and ThinkPad Yoga 460 Hardware Maintenance Manual
Wire
Voltage (V dc)
Red +2.5 to +3.2
Black Ground