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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Because it is handled automatically by the device. The “percentage” of power shown on your device lies all the time. It’ll say “100%” but it’s really sitting at 85-90% depending on the model. It just shows it’s at 100 because your average consumer doesn’t know to not overcharge a battery and they didn’t want to get a deluge of complaints from people saying their battery won’t charge to full.
If it has a lithium battery, it manages its own power levels (or the charger handles it).
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