Lenovo SL300 User Manual download pdf (Page 39)

Checking the backup battery

Do the following:

1. Power off the computer, and unplug the ac adapter from it.

2. Turn the computer upside down.

3. Remove the battery pack (see “1010 Battery pack” on page 63).

4. Remove the backup battery (see “1160 Backup battery” on page 86).

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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Lenovo SL300 User Manual Page 39