The damage is due to fever.
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MagSafe this magnetic wireless charging method, in theory, will accelerate the iPhone battery loss speed, the reason is that MagSafe magnetic charging this way, in the same use of the case, it is easier to make the battery heat, heat is easy to speed up the loss of the battery.
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But this speed up, as long as the usual attention to use basically can be ignored.
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On the other hand, MagSafe does solve the problem of wireless charging alignment, the official propaganda \"click\
The charger will do no harm to the battery. It's the constant use of your phone every day that can damage your battery