Eli5 How does my phone know how much % battery is left?
In: 4
Batteries lose strength as they lose charge. Think of it like a barrel filled with water with a small hole in the side of the bottom: when the barrel is full, the pressure of all the water will cause the stream to come out much faster. As the barrel empties, there’s less pressure on the water, so the stream becomes less and less forceful. So if we look at the stream of water, we can estimate roughly how full the barrel is, and we can be more accurate if we’ve filled it up and emptied it out a few times to get used to it a bit.
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