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I discovered that in my laptop settings, I can select an option that is best chosen when the laptop is mainly connected to AC power, and apparently keeps the battery at a lower SOC. I found this feature also in a Sony smartphone (slightly different operation, it would keep the battery at 90% max during the night, and would fully charge it at dawn) and I found out that's actually good for battery health.

Why is that? What happens inside a battery when it is kept at 100%?

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    $\begingroup$ This topic is discussed multiple times on internet and I guess this site too. In short, at full charge, there are accelerated side reactions decreasing the cell capacity and increasing the cell internal resistance. As the result, the static cell aging is faster. $\endgroup$ – Poutnik Apr 28 at 3:59
  • $\begingroup$ Thanks for the prompt answer. Could you be more specific? $\endgroup$ – Pellagra Apr 28 at 6:50
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    $\begingroup$ It was just a comment, not answer. I was not going to go into details. You can search them out. Related: chemistry.stackexchange.com/questions/124781/… and chemistry.stackexchange.com/questions/142688/… $\endgroup$ – Poutnik Apr 28 at 7:00

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