I have experienced it on multiple mobile phones and my laptop. If i charge the battery to 100% the discharge to 99% is way slower than if i charge the battery to 90% and discharge to 89%. And this makes me charge the battery to 100% even when I know that it is bad for the battery just because the charge lasts much longer than charging to 90 or 80%. Is it related to some kind of chemistry?
I am ok with eli 20 also. Thanks.
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It’s not necessarily intentional, but measuring battery capacity/charge is not easy.
Typically you do it by measuring the voltage over the terminals, but that will also change depending on how much load is out on the battery (i.e. it’s high when the battery is not being used, drops when the phone pulls a lot of current).
Modern smartphones are a little more sophisticated, they might use impedance testing, voltage testing, a coulomb counter that records how much power has been used and also some algorithms that adapt these calculations to the battery’s behaviour over time.
All that’s to say, it’s not an exact process and things can be slightly wrong all the time.
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