An EV for example: if the car has 10% charge left, does the battery have less power or amps or whatever than it does when it’s at 90%? Or an iPhone at 20% vs 80%…same question. Or, from the battery’s perspective, even to 1% left, it’s either on or off, regardless of charge remaining?
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No, it doesn’t and in some cases that’s actually a way of measuring how much charge is left. A battery that is partially charged will have less voltage between the two poles.
How stable the voltage is depending on charge, is very dependent on the type of battery though, and from what I remember one of the reasons we use Lithium batteries is because their voltage output is very stable compared to how charged they are.
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