It will, but not very much.
The biggest damage to the battery is using it while charging. The whole process of mobile phone battery charging includes three stages: rapid charging, continuous charging and trickle charging. After the first two stages, although the system power display 100%, but in fact the battery has not really reached saturation state.
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Cheap magnetic charger is no harm to the mobile phone, because it is wireless charging, they are cheap, they are also quality assurance, so the harm to the mobile phone is no, you can rest assured to use, if you buy the kind of deceived false, then you dare not say, personal said are the kind of magnetic charger bought by formal channels. Yeah, cell phones are harmless.
The Apple 12 wireless magnetic charge hurts the battery because they are not in direct contact