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A 1500mAh rechargeable battery, fully charged. If the discharge current of 1500mA can reach 1 hour, it indicates that the capacity is sufficient. Still use 750mA discharge for 2 hours to detect. But when the voltage is 0.9V (1.2V rechargeable battery), there is still a nominal current released. How to understand this?

The battery capacity we refer to actually refers to the usage capacity of the battery. That is to say, the amount of electricity released when a 1500mAh rechargeable battery is discharged from 1.45V to 0.9V is the capacity we need. We cannot use the capacity released below 0.9V, and the amount of electricity released is not much (discharging too low can also affect the battery's service life). Generally, the discharge platform of a good charging battery is relatively good, for example, a 1500mAh battery is discharged from 1.45V to 0.5 V

If the current discharge of C is set to 0.9V and left for 120 minutes, then we can say that the battery's usage capacity is 1500mAh. The relationship between current and voltage time during this period is shown in the figure:

A good battery discharge platform will experience a rapid decrease in voltage after 0.9V, resulting in a small amount of electricity being discharged in a short period of time. On the contrary, when discharging from 1.45V to 0.9V, batteries with poor performance experience a rapid decrease in voltage, but a slow decrease in voltage after 0.9V. These batteries have poor performance and generally have very low capacity.

Note: I: Ampere or milliampere;

f: [1/hour], when describing, often only "number" is mentioned, without mentioning units;

C: Battery capacity, in ampere hours or milliampere hours.

For example, when the battery capacity is 800mAh and charged at a current of 0.1C, it is equivalent to clearly stating:

Charging current of the battery I=0.1 [1/hour] X800 [milliampere hour]=80 [milliampere hour]

F, also known as "n hour charging (discharging) rate", f=1/(n hours)

Measuring battery capacity usually involves measuring battery voltage. The charger detects the battery voltage during charging and considers it fully charged when the voltage reaches the specified voltage value. When the voltage of a lithium battery reaches 4.2V, it is considered fully charged. The accuracy of the voltage meter for detecting voltage should reach plus or minus 1%. Damage caused by overcharging of lithium batteries. If you want to monitor battery charging and discharging, there are mature circuits in the book for reference. If it's just a measurement, it's easy to do. Calculate the load resistance based on the capacity, discharge with standard discharge current, and then test the voltage. As long as it can reach or approach the nominal discharge time, it's enough.

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