Checking The Coin-Cell Battery - Lenovo ThinkPad T540p Maintenance Manual

Checking the coin-cell battery

To check the coin-cell battery, do the following:
1. Remove the battery pack. See "1010 Battery pack" on page 60.
2. Remove the coin-cell battery. See "1100 Coin-cell battery" on page 69.
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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Hardware Maintenance Manual
Wire
Voltage (V dc)
Red +2.5 to +3.2
Black Ground