Zte GRAND X Plus User Manual page 19

WARNING!
Use only ZTE-approved chargers and cables. The use of
unapproved accessories could damage your phone or cause the
battery to explode.
1. Connect the adapter to the charging/micro-USB jack. Ensure
that the adapter is inserted in the correct direction. Do not
force the connector into the charging jack.
2. 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.
3. Disconnect the charger when the battery is fully charged.
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