How a smartphone actually measures battery power
Hello dear subscribers and guests of my channel. Please tell me, have you ever been in a situation when your smartphone with a charge of 30-20 percent suddenly discharged in just a couple of minutes. Or, on the contrary, was it charged up to 100% in some fifteen minutes spent on charging?
And, probably, you quite logically had a question: How so? In this article I will tell you how the charge measurement actually takes place in modern smartphones.
How is the battery level measured in a smartphone
Strange as it may sound, but the modern method of calculation is extremely simple and therefore cheap. And we get the feeling that we see a real battery charge, and the hint from the system that there are so many hours left before the battery is discharged convinces us of this even more.
The trouble is that this is completely wrong and the readings on the smartphone have nothing to do with the real battery charge, and that's why.
In reality, it is impossible to separate the concept of measuring the battery level of a smartphone and the factory statistics of battery tests.
What happens in reality
So at the manufacturing plant, tests are performed on a single battery model and a so-called reference graph is drawn up.
The above graph shows a typical picture of absolutely all modern inexpensive Li-ion batteries.
So the Y-axis shows the voltage value, and the X-axis shows the battery charge level as a percentage.
So, based on a specific graph formed for a specific Li-ion battery of a specific smartphone, the operating system and calculates the amount of charge, which is shown to us on the screen phone.
In this case, the data on the voltage value is received by the battery voltage controller. Further calculations are performed by the built-in program.
And at the same time, the obtained measurement is constantly compared with the reference graph, and thus the amount of charge is calculated and information is displayed on the display.
And in fact we get the following:
- The “measurement” method is based on a comparative analysis of reference parameters and the current voltage value.
- That is, the smartphone does not measure, but only builds an assumption from the data obtained and shows this estimated value to us.
Hence the next question: How to measure the real battery capacity of a smartphone?
How to measure the real capacity of a battery
The easiest way to measure the real capacity of the battery is to use special gadgets, for example this one:
The measurements obtained in this way will reflect the real picture of the charge of your battery, and in 99 cases out of 100 it will differ from the declared parameters.
That is, if you have a battery on your phone declared 4000 mAh, and real measurements showed 3700 mAh, then the real capacity of the battery is lower and is 92.5% of the declared one.
The situation will be even worse when you decide to replace the old battery with an analogue.
In this case, the reference sample will not go anywhere, and the actual performance may differ so much that the indicator will “lie” very much, since its initial standard does not correspond to the measured (new) batteries.
That is why we often hear - changed the battery got worse. Now you know why this is happening.
Hence the conclusion: if you change the battery, then only for the original, completely identical to the "tired" battery. Or you can endure and squeeze the already pretty battered battery to the last.
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