Do MagSafe power banks work with phone cases?

Yes, with MagSafe-compatible cases. The magnets need to align through the case. Apple, Otterbox, and Spigen MagSafe cases work great. Thick non-MagSafe cases will block the magnetic connection and reduce charging speed.

Is wireless MagSafe charging bad for my iPhone battery?

No more than wired charging. Modern iPhones manage battery health intelligently regardless of charging method. MagSafe generates slightly more heat than wired, but Apple's thermal management prevents damage. Using Optimized Battery Charging in Settings helps further.

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