The unhealthiest state for a battery is 100% but also 0% because quite Literally all the electrons are on one side…that is quite the uneven state… the way a battery works in general is you move electrons from one side to the other electrode so ideally you want to avoid those uneven states.
If you have that happen, over time crystallisation can happen, making battery cells unusable and even making them bloat and prone to exploding
The healthiest state for a lithium ion battery to be in is somewhere around 50% which is why you also find your new phone somewhere around 50% charge in the storage when u buy it.. or a bit less because the battery after all drains with time…this is no accident, really more a measure to keep the battery safe in storage for longer.
Many companies tend to have protective mechanism there. Some give features that prevent your phone from reaching those too high or too low areas. Others just plain do it and not tell you. Meaning your 100% and 0% isn’t exactly the truth.
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