I always hear that it’s bad for lithium batteries to charge over 90% or over 90% so why is there no setting to stop charging after a certain threshold on my phone, kindle, pc or e-skate?
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There is, some smartphone manufacturers have those options in the settings, others will integrate some safety measures that are not selectable. One thing they all do is slow or stop charging if too hot.
My ASUS phone allows for:
Speed of charge – too fast isn’t good for the battery, but might be needed by the user, when connected to a fast charger you can slow down the rate of charge.
Charge limits – what OP asked, you can set how much will the phone charge to, 80% is what I have mine set to.
Scheduled charging – you don’t need to worry about leaving it charging overnight to have a full charge in the morning, it will slowly charge up to 80, then trickle charge until near the scheduled end time where it will continue to charge up to 100.
Low battery warnings – going low battery isn’t good for a Li-Ion battery either, you can set when it asks you to charge and if you want to go into power saver automatically.
On my laptop you can tell it to stop charging at 90%, although the behaviour is a bit less consistent as it depends on the OS software, BIOS and BMS firmware…
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