Basically the title.
How do devices measure the amount of energy stored in them? What do they measure to say that I have 87% battery left?
In: 3
The voltage of the most common battery chemistries is proportional to the charge level. The battery loses strength as it’s getting discharged. The device has a regulator in it that draws more current to allow it to operate normally. With other types of cells like NiMH it doesn’t work. The charger could place a constant dummy load on it, and measure the time until the battery is flat.
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