Zte Blade A3 Prime User Manual page 11

2. Connect the charger to a standard AC power outlet.
3. 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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