ZTE 730
why do the phone still have that abnormal warning even tho the phone its not evcen hot or use or have any other running programs
They have this warning to avoid further damages to your phone that may also result to accidents that may harm someone. It is best to not let your phone heat up so much as this will damage the battery.
Its my experience that if you have any running programs while charging, the battery overheats. Especially if your in your search engine. Also it helps considerably if you remove your phone case. It blocks in heat from the charging process.