Lenovo Thinkpad edge 13, Hardware Maintenance Manual, Page: 49 / 156

3. Remove the battery pack (see “1010 Battery pack” on page 64).
4. Remove the backup battery (see “1090 Backup battery” on page 81).
5. Measure the voltage of the backup battery. See the following figure.
Wire Voltage (V dc)
Red +2.5 to +3.2
Black Ground
Red (+)
Black (-)
• If the voltage is correct, replace the system board.
• If the voltage is not correct, replace the backup battery.
• If the backup battery discharges quickly after replacement, replace the system board.
Chapter 3
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