Comment

Li-ion and LiPo batteries don’t have the mini cycle problem as much as the NiMH batteries have
Keeping always plugged in is terrible advice for Li-ion/LiPo batteries (except if your device is smart enough to support reducing tear on battery with intelligent charging behaviour, like not charging above 80%)
Li-ion absolutely dislike being fully charged and will suffer extreme tear, if you let them always be charged to 100% -> reduces max capacity and increases risk of swelling
this 80% labeled as 100% is mostly present on bigger batteries like car batteries, which have guarantees with min cap decrease over 5 to 10 years. Phones with guarantees of 1 or 2 years generally have near100% as 100%, as it is marketing relevant to have bigger numbers than competitors without need to offer long battery guarantees.
fully discharging is recommended at least some times in order to recalibrate the percentage calculation (if a charging event is without interruption from lower than x%, the battery controller is counting the watthours pumped into the battery until it reaches the point where less than x ampere charging are required to hold the desired voltage. With this counting, you can then adjust the graph used to calculate percentage of capacity still available based on the corrected (compensated for drop of voltage due to current usage) Voltage of the battery)

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