If only there were a way to quickly swap out defective, used batteries for new, safe batteries without needing to return a critical device to the manufacturer.
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I'm not saying it's not possible, of course it is, but there is some friction and difficulty especially if you seriously want to compete with Apple, Samsung, Oppo, Xiaomi, etc.
Fairphone exists[0]. Nobody is in the market for either a Fairphone vs Galaxy vs Pixel.