Zte BLADE A3 User Manual page 12

1. Connect the charger to a standard AC power outlet. If the
phone is on, you'll see a charging icon, such as
appear on the Status Bar.
2. Disconnect the charger when the battery is fully charged.
NOTE:
If the battery is extremely low, you may be unable to power on
the phone even when it is being charged. In this case, try again
after charging the phone for at least 20 minutes. Contact the
customer service if you still cannot power on the phone after
prolonged charging.
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