Charge without a case
The bad place with the protective case is the heat dissipation, if the weather is relatively 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.
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.
It's not good to put a protective case on the charger head while charging. All electrical appliances, including chargers, will generate heat in the state of energized work, and in general, the longer the energized work time, the more heat will be generated.
The power of the ordinary charger is relatively small, and the heat generated at the time of work is not a lot. However, after wearing the protective cover, the heat will build up quickly, and may burn and catch fire.