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The battery level your phone shows is just made-up bullshit. It’s roughly accurate of course, but they can’t really check how much charge is in the battery with 1:100 accuracy, so it just counts down at a roughly constant rate making adjustments to the rate based on rough measurements of broadly whether the battery is “real full” or “mostly full” or “almost empty” or whatever.
You can get a voltage sensor that is accurate to three decimal points for literal cents, so yes, your phone does know how much energy is left in the battery. It also has current sensors, so knows how much energy is being used.
It does not know the capacity loss of the cell over time. That is why you should let the battery go completely dead and then charge it to max capacity as this will recalibrate the coulomb meter on the battery manager - batman
Preach sibling
Idk how multiple super assertive people all got the idea that “voltage = battery percent” and all wanted to yell it at me the same time lol