It is not possible to charge with a mobile phone case, because the mobile phone case has the function of isolating signals, which will make the charging speed slow. The mobile phone wireless charger on the market will cut off the power when charging with the mobile phone case during use, so the charging rate will slow down
Wireless charging can be used with a phone case.
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But it can't be metal. The best distance of wireless charging is 2-4mm, the coil can not be directly close, so it is just the best distance between the mobile phone shell and the wireless charging shell.