Samsung SCH-N330PWMXAR - Manual (Page 30)

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Section 2
Battery indicator
The battery indicator ( ) in the upper-right corner of
the display indicates battery power level. Three bars
indicate a full charge, while an empty icon (
) indicates
an almost empty battery.
Two to three minutes before the battery becomes too low
to operate, a blinking empty battery icon (
) appears in
the display and a tone sounds.
If you continue to operate the phone without charging, it
shuts down.