How much fast charging costs in terms of battery capacity?

Have you noticed how phones with fast charging tend to have smaller batteries than phones that charge slowly? We did. We even asked manufacturers about it, however, they were pretty tight lipped about the details. So, we decided to do our own research. We searched through our database for devices from the same maker, that launched around the same time and that have the same dimensions (down to the tenth of a millimeter), but offer different charge speeds. The idea is to remove as many variables as possible. Often times addition of fast charging is the difference between vanilla and Pro...

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