Avoid phone cases!
It is recommended not to charge the terminal with the case or any other protective device to ensure that the battery charges quickly.
The batteries are usually composed of lithium ions, which are heated when they are in use. Sometimes you may have noticed that your smartphone gets very hot when you are using it or when it is charging.
The colder the battery is, the shorter the time it takes to charge. In addition, many manufacturers have control mechanisms to slow down the battery charge if the temperature of this is very high.