How to drain completely very bad calibrated battery?
My iPhone SE’s battery worked pretty fine until I calibrated it. It goes from 100% to 40% in one seconds, then it lasts forever on 40% and then turns off. When it turns off it shows the without battery logo, but when I press the button the another time, it turns on, it lasts a few seconds and turns off again, and the same over and over again. How can I drain the battery to calibrate it properly?
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