I've been trying a similar experiment for several years now. I have a four year old iPhone, and for most of its life, the battery level has been kept between 30% and 70%. Settings => Battery => Battery Health and Charging says that the maximum capacity is 91%.
No idea whether that's better or worse than average, but I mention it so others can compare. I can say that this is the first time I've tried this experiment, and this phone has already outlasted any previous phone I've had.
No idea whether that's better or worse than average, but I mention it so others can compare. I can say that this is the first time I've tried this experiment, and this phone has already outlasted any previous phone I've had.