Samsung SGH-E300 - Low Battery Indicator

Getting started
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2. Plug the adapter into a standard AC wall outlet.
3. When charging is finished, unplug the adapter
from the power outlet and disconnect it from the
phone by pressing the buttons on both sides of
the connector and pulling the connector out.
Note : You must unplug the adapter before removing
the battery from the phone during charging;
otherwise, the phone could be damaged.
Low battery indicator
When the battery is weak and only a few minutes of
talk time remain, a warning tone sounds and a
message repeats at regular intervals on the display.
When this happens, your phone turns off the
backlight to conserve the remaining battery power.
When the battery level becomes too low, the phone
automatically turns off.