Come on man, please tell me why that matters? Charging at 15W is still charging at 15 W when spread over 1 or 10 batteriesWhat Apple should do is to divide the battery in iPhones into two units, with each being able to charge separately. This is what many Android OEMs are doing. That way, you are essentially "double" your current charging speed as you are not charging one huge battery, but charging two smaller batteries at the same time.
Come on Apple, even Xiaomi figured this out.
Meanwhile, Huawei is doing 50W wireless charging...
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Last I checked wireless was slower than wired.in all phones Did I miss something?