18650 li ion rechargeable battery

What is the test method of 18650 lithium battery capacity?

In fact, the method is very simple. To conduct the 18650 lithium battery capacity test, you only need to prepare the corresponding instruments, and after understanding the corresponding steps, the entire capacity test process will become very simple.

18650 lithium battery capacity test method 1.

A simple method. We need to use a multimeter and a high-power resistor. First, we need to fully charge the 18650 lithium battery, and then connect the battery to a high-power resistor, so that we can pass the total discharge time capacity = 0.37A*time Use a formula to get the specific capacity, but because the method is simple and the instrument is not particularly accurate, there is a certain error.

18650 lithium battery capacity test method 2.

A formal and more professional method: the instrument that needs to be used is a battery capacity tester. First, we need to charge the battery to at least 4.20V, and then leave the battery for 1 hour to discharge at a constant current. The arbitration method is based on the 0.2 rate. For example, if the battery has a capacity of 1000mAh, it will be discharged at a constant current of 200mA until it is cut off at 2.75V. The calculation formula is: time * constant current = battery capacity. This method is more accurate in accordance with the national standard 18287 lithium battery regulations.

18650 lithium battery capacity test method 3.

The third method is divided into three steps: the first step is to fully charge the battery to make it reach the rated voltage, which is generally around 4.2V; the second step is to discharge the battery to the rated voltage and record the released voltage. How much power, the voltage setting at this time is generally 3.0V; the third step, we charge the battery to the normal standard, generally, this standard is set between 3.8V-4.0V, the capacity of the 18650 lithium battery we set at In the second step, it can be concluded that the recorded capacity is the approximate capacity of the battery.