Samsung and Apple both released new phones this year that let you enable a setting where it prevents you from charging your phone’s battery beyond 80% to improve its lifespan. How does this work?
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its because it degrades the anode and cathode faster, this also happens when you discharge it below typically 20-30 percent. as simple as i can possibly put it when you charge and discharge a battery you are slowly coating the anode with the cathode material and vice versa if you look up electroplating you will understand this process more. This effect is much more pronounced at the extremes of the battery voltage capacity.
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