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> To treat the cells well requires sacrificing some capacity to reduce the voltage stress on the cells.

Battery-power devices like smartphones should have a mandatory control of what percentage of battery it should be charged up to.

For Mac there's this nice utility AlDente https://apphousekitchen.com

I think this is a standard feature on Samsung phones, but I really wish it was standard in Android.

https://github.com/sriharshaarangi/BatteryChargeLimit seems to work anywhere there's root access (though yes I absolutely agree that it should be a standard part of the OS)