Checking The Coin-Cell Battery - Lenovo ThinkPad P51s Manual

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 64.
2. Remove the coin-cell battery. See "1090 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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T570 and P51s Hardware Maintenance Manual
Wire Voltage (V dc)
Red +2.5 to +3.2
Black
Ground