Lenovo IdeaPad S9e -FR - Manual (Page 39)

4. Remove the backup battery (see “1110 Fan, backup battery, and system board”
on page 77).
5. Measure the voltage of the backup battery. See the following figure.
Red (+)
Black (-)
Wire Voltage (V dc)
Red +2.5 to +3.2
Black Ground
v If the voltage is correct, replace the system board.
v If the voltage is not correct, replace the backup battery.
v If the backup battery discharges quickly after replacement, replace the system
board.
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