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I'd say the heat generation is the biggest factor in fast charging wearing out the battery - lithium batteries do not like heat, and base Qi generates quite a lot of it (have a Qi charger for my Galaxy S5). Can only imagine the fun you run into trying to pump more current through them without melting the phone.

Google may well be doing this because they can't guarantee cooling on the third-party stands, and would have to throttle the charge rate when the phone started to overheat. Guess they might be pre-empting it.




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