Eli5 How does my phone know how much % battery is left?
In: 4
Batteries don’t put out a constant voltage. A fully charged battery has a higher output than a drained one. The power control circuitry measures that output voltage to guesstimate how much useful charge is left in the battery. I say “guesstimate” because that voltage depends on some other factors that you can’t perfectly account for. You can observe the battery through several full charge/discharge cycles to calibrate your measurements for more accurate guesstimations, but at the end of the day it’s not gonna be an exact figure.
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