There is no harm, that is, heat, but do not put it in strong sunlight to charge, easy to overheat the battery explosion. Generally, iphones and ipads with protective cases do not affect charging, and protective cases are reserved for charging ports with openings. Some protective cases are very thick, if charging with a protective case affects the heat dissipation of the fuselage, easy to cause heat, so it is not recommended to charge with a protective case. However, the bad place with the protective case is heat dissipation, if the weather is cold, there is no problem, if it is summer, there is no air conditioning in the charging place, there may be safety risks, in addition, the battery overheating will affect the battery life.