Zte BLADE V7 User Manual page 21

WARNING!
Use only ZTE-approved chargers and cables. The use of
unapproved accessories could damage your phone or cause
the battery to explode.
CAUTION:
Do not change the built-in rechargeable battery in your
phone by yourself. The battery can only be changed by ZTE
or ZTE authorized service provider.
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 power outlet. If the
phone is on, you'll see a charging icon, such as
21
or ,