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The main culprit is that anyone estimating battery life in percentages. It's about voltage and current draw. The battery voltage can be read directly.

About being slow, I suppose it does run windows and its infamous 'defender'

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jmb99 9 hours ago | parent | next [-]

> The main culprit is that anyone estimating battery life in percentages.

I thought this was a solved problem, like, decades ago? At least I remember even the first gen MacBooks having accurate battery percentages, and it’s a more vague memory but my PowerBook G4 did too I think.

	▲	xxs 5 hours ago \| parent [-]
		The "accurate" charging level mostly happens with specific amount of charge cycles (i.e. new). Laptop batteries suffer from higher temperature (over 60C), overcharging (over 4.22 per Li-Ion for most chemistries).

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perching_aix 6 hours ago | parent | prev [-]

No, I think it's fairly easy to see that a third of the charge suddenly disappearing is a fairly uncommon behavior.

Same for your Windows idea...

	▲	xxs 5 hours ago \| parent [-]
		"A third" is again fraction/percentage - it's still a representation stuff that depends on charge and charge cycles... and likely previous over charging and heat (Li-Ion doesn't like heat). To put it simply: the charge level, usually, is just a lookup table for voltage (not under load).