why completely used up batteries seem to have a small bit of energy again after some time.
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Apart from the chemical explanation, phone batteries seem to gain charge because of a software solution: they measure battery voltage when you turn them on, but after that they just measure how much power they use and estimate your battery level. It’s generally a good idea to state a lower level than what’s actually there compared to showing let’s say 15% and then turning off because it was overestimated and it ran out. This means that the phone undershoots the percentage and says for example 10% for a 15% battery, but when you restart it, it measures the real voltage again and returns to 15
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