Nokia Lumia 521 User Guide - Page 13

charging the device. The efficiency of USB charging power varies significantly, and it may take - specification

Page 13 highlights

2. When the battery is full, disconnect the charger from the phone, then from the wall outlet. You don't need to charge the battery for a specific length of time, and you can use the phone while it's charging. If the battery is completely discharged, it may take several minutes before the charging indicator is displayed or before any calls can be made. Tip: You can use USB charging when a wall outlet is not available. Data can be transferred while charging the device. The efficiency of USB charging power varies significantly, and it may take a long time for charging to start and the device to start functioning. First connect the USB cable to the computer, then to your phone. When the battery is full, first disconnect the USB cable from your phone, then from the computer. © 2013 Nokia. All rights reserved. 13

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2.
When the battery is full, disconnect the charger from the phone, then from the wall outlet.
You don't need to charge the battery for a specific length of time, and you can use the phone while
it's charging.
If the battery is completely discharged, it may take several minutes before the charging indicator is
displayed or before any calls can be made.
Tip:
You can use USB charging when a wall outlet is not available. Data can be transferred while
charging the device. The efficiency of USB charging power varies significantly, and it may take
a long time for charging to start and the device to start functioning.
First connect the USB cable to the computer, then to your phone. When the battery is full, first
disconnect the USB cable from your phone, then from the computer.
© 2013 Nokia. All rights reserved.
13