Samsung SCH-N150 - Manual (Page 39)

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Charging the battery
Your phone is powered by a rechargeable standard Li-Ion battery. Only use
Samsung-approved adaptors and batteries. These adaptors are designed to
maximize battery life. Using other adaptors will invalidate your warranty and
may cause damage.
When the phone has finished charging it can be disconnected.
Low battery indicator
You can tell whether or not your battery needs to be recharged by checking the
battery indicator (this icon is located in the upper-right corner of the
display screen). The presence of all three bars indicate a full charge. No bars
(the battery icon is empty) means your battery must be charged.
The empty battery icon
Two to 3 minutes before the battery charge level gets too low to operate the
phone, the battery sensor will let you know by blinking an empty battery icon
( ), and sounding a tone. If you continue to operate the phone without
charging the battery, the phone will automatically turn off. If this happens, your
wireless call will be terminated. However, if you plug into a charging device,
you can continue your call. Be sure to monitor the battery strength icon and
make certain your battery is adequately charged.