1.5v Carbon battery.The relationship between battery voltage and capacity

　　However, lithium-ion batteries have a useful characteristic for measuring electricity, which is that during discharge, the battery voltage gradually decreases with the passage of electricity and has a considerable slope. This provides us with another approximate way of measuring electricity. The method of taking the battery voltage is similar to measuring the height of the water surface in a water tank to roughly estimate the remaining water volume. However, in reality, the voltage of the battery is much more complex than measuring the height of the calm water surface in a water tank

　　There are several instabilities in using voltage to estimate the remaining capacity of a battery:

　　1. The voltage value of the same battery varies with the magnitude of the discharge current under the same remaining capacity

　　The larger the discharge current, the lower the voltage. In the absence of current, the voltage is highest

　　2. The influence of environmental temperature on battery voltage. The lower the temperature, the lower the voltage of a battery of the same capacity

　　3. The impact of cycling on the battery discharge platform,

　　As the cycle progresses, the discharge platform of lithium-ion batteries tends to deteriorate. The discharge platform decreases, so the capacity represented by the same voltage also changes accordingly

　　4. Different manufacturers and capacities of lithium-ion batteries have slight differences in their discharge platforms

　　5. The discharge platforms of lithium-ion batteries with different types of electrode materials vary greatly. The discharge platforms of cobalt lithium and manganese lithium are completely different

　　All of these can cause voltage fluctuations and voltage differences, making the battery capacity display unstable

　　When measuring the battery capacity of a mobile phone using voltage, it is impossible for the phone to be in a low current standby state. Temporary high current loss, such as turning on backlight, ringing, and especially passing through, can cause the battery voltage to quickly decrease. At this time, the displayed capacity of the phone will decrease more than the actual capacity. However, when the high current is removed, the battery voltage will rise, which will cause the phone capacity display to rise instead, which is an unreasonable phenomenon

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