Apple mobile phone battery power monitoring method introduction

How is the iPhone battery power monitored? I believe that many fruit powders are not clear about how to monitor the battery power of Apple. The following is a brief introduction to Apple's battery power monitoring method.
We can always know the remaining battery power from the battery at the top right of the phone, thanks to a fuel gauge inside the phone battery. This fuel gauge is used to indicate the amount of power remaining in the rechargeable battery and the time the battery can continue to be powered under certain operating conditions. There are currently three types of fuel gauges in the device:
1. This method is used in the Coulomb iPhone. The coulomb counter can accurately track the battery's power change with an accuracy of 1%. In addition, by matching the battery voltage and temperature, the influence of factors such as battery aging on the measurement results can be greatly reduced. In the positive and negative strings of the battery, such as a current check resistor, Vsense is generated when a current flows through the resistor, and the current flowing through the battery can be calculated by detecting Vsense.
2, voltage test method voltage test method This method is very limited to the protection of the battery. This method is relatively simple, which means that the battery's power is obtained by simply monitoring the battery voltage. The battery's power and voltage are not linear, so the test method is not accurate, and the power measurement accuracy is only over 20%. Especially when the battery power is lower than 50%, the calculation of the power consumption of the mobile phone will become very inaccurate.
3, battery modeling method to obtain a precise data sheet is not simple, because the relationship between voltage and power also involves the battery temperature, self-discharge, aging and other factors. This method is based on the discharge curve of the battery to establish a data table, the data table will indicate the value of the electricity at different voltages, this method can effectively improve the accuracy of the measurement. Only a combination of many factors to make corrections can produce a satisfactory battery measurement.
Among the three commonly used methods mentioned above, the Coulomb is the accuracy of the three methods, which is also the least damage to the battery, almost no damage to the battery, and the iPhone battery is limited. The use of this is also one of the best ways to use the iPhone battery.