interesting, my new mac does something called "charging on hold" to avoid fully charging when you rarely use unplugged... stops at like 70-80% but you can force it to charge to full. Why is 70-80% an efficient hold level?
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I get that it’s about battery longevity etc. I’m asking where the specific 70-80% number comes from. A fundamental property of lithium? Random threshold on the knee of a discharge curve?
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Li batteries are degrading from the day they're made, and there's a bunch of reasons that combine to lower overall capacity, but long story short: the more energy you put into the physical chemistry, the more the electrodes literally eat themselves away
pubs.rsc.org/en/content/art
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There's a voltage-soc curve for every battery. Higher state of charge, higher voltage. At max voltage a chemical rxn is more likely to occur that causes the degradation. If your battery could live in the mushy middle, it would last way longer.
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