Responding To A Low Battery Condition; Saving Files; Turning Off The Alarm; Reducing Screen Brightness - Acer Extensa 660 User Manual

When you are operating the computer on battery power and the charge
remaining is down to between 10% and 20%, the battery-low indicator
blinks and an audible alarm sounds. When this happens you should take
the following actions to conserve battery power and reduce the possibility
of data loss.

Saving files

Turning off the
alarm
Reducing screen
brightness
Connecting the AC
adapter
Suspending
operations

Responding to a Low Battery Condition

Save all open files frequently while the
computer is in a low-battery condition.
Turn off the audible alarm by pressing Fn-End
(Mute).
Reduce screen brightness by pressing Fn-↓.
If you have access to AC power, connect the
computer to the AC adapter. You can do this
without turning off the computer.
Press Fn-F2 to put the computer into 0V
Suspend until you connect to AC or install a
charged battery.
Responding to a Low Battery Condition
Battery Operation 6-7