IBM ThinkPad 310E User Manual page 180

Note:
Make sure Sleep Manager is installed
and the hibernation file is present and
valid; otherwise, the computer enters
standby mode upon battery-low. For
more information on Creating the
Hibernation File, see page 4-15.
Battery-low Warning Beep
This parameter allows you to enable or disable the warning beep
generated by the computer when a battery-low condition occurs.
The default setting is Enabled.
Sleep Upon Battery-low
This parameter enables the computer to enter standby or
hibernation mode when a battery-low condition takes place. The
default setting is Enabled.
Power Management Settings
Appendix C. BIOS Utility
C-15