Why does fast charging only works until about 50%-60% of battery capacity and charge rate slows down after that?

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Why does fast charging only works until about 50%-60% of battery capacity and charge rate slows down after that?

In: Engineering
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Imagine stuffing small soft foam balls into a box. Initially it is easy to stuff the balls in as there is a lot of space in the box and there is no need to compress the foam balls much. But as the box fills up and you want more foam balls in it, you have to press harder and squeeze the balls a bit in order to fit. This slow you down.

The charging circuitry requires power to be limited when the battery is nearing full, there’s less space for energy to get in and forcing it in could be dangerous. This mostly applies to phone batteries (Li-Ion), car batteries can take much more abuse.

On modern phones they found different ways to produce the same type of battery so they can force more power by increasing the voltage (and therefore the amperage). But this is dependent on the fast charging standard or the device’s manufacturer. Probably yours has an older or simpler system.