Can you tell the charge level of a cell phone battery from its voltage?
And if so, which voltage corresponds to which charge level?
(No Ratings Yet)
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This is enormously unreliable and is never done.
At best, this goes with new batteries.
In any case, a state test must always be carried out under a certain load. A pure voltage measurement is not a load.
If only the question is how exactly the whole thing is going. The battery has a rated voltage of, for example, 3.7V. If it is fully charged, the voltage rises to 4.2V and if it is completely discharged 3,2V or something. If consumption is constant, it could be converted linearly (3.2V = 0%; 3.7V = 50%; 4.2V = 100%).
In reality, it depends on consumption.
Yeah, you can. Which voltages are exactly depends of course on the specific battery.Google according to “discharge curve” and the battery type.