ZTE ZMAX - Manual (Page 20)

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1. Connect the adapter to the charging jack. Ensure that the adapter is
inserted with the correct orientation. Do not force the connector into
the charging jack.
2. Connect the charger to a standard AC wall outlet. If the phone is on,
you’ll see a charging icon, such as or , appear on the status
bar.
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 10 minutes. Contact customer service if
you still cannot power on the phone after prolonged charging.