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Heck make the phone even thinner and sell it with the battery pack and we'll have reinvented phones with swappable batteries

The Moto Z was ahead of its time! (it was thinner and had a magnetic battery add-on).

You did have to pay extra for the battery, mind.

Except now your phone is getting energy wirelessly, which is less efficient and gets hot...

A big loss for a small coolness factor.