Lenovo ThinkCentre A35 Service Manual page 30

17) BAT (Battery)
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type
recommended by the manufacturer.
Dispose of used batteries according to the manufacturer's
instructions.
If you want to erase CMOS...
1.Turn off the computer and unplug the power cord.
2.Remove the battery and wait for 30 seconds.
3.Re-install the battery.
4.Plug the power cord and turn on the computer.
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