ZTE ZMAX - Manual (Page 160)

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Phone Heating
Your phone may become warm during charging and during normal use.
Electrical Safety
Accessories
Use only approved accessories.
Do not connect with incompatible products or accessories.
Take care not to touch or allow metal objects, such as coins or key rings,
to contact or short-circuit in the battery terminals.
Never puncture the surface of the battery with sharp objects.
Connection to a Car
Seek professional advice when connecting a phone interface to the
vehicle electrical system.
Faulty and Damaged Products
Do not attempt to disassemble the phone or its accessories.
Only qualified personnel can service or repair the phone or its
accessories.
If your phone (or its accessories) has been submerged in water,
punctured, or subjected to a severe fall, do not use it until you have taken
it to be checked at an authorized service center.