18650 lithium battery capacity measurement method steps.

18650 lithium battery capacity measurement method steps.

Whether the capacity of 18650 lithium batteries meets the standard not only affects the user experience, but also tests the manufacturers in the long run. When consumers purchase batteries, there is no need to worry about foreign original batteries, because domestic packaging factories also use imported lithium battery packs, and their 18650 lithium battery capacities are not different. The important thing is that these 18650 lithium battery capacities are genuine.

18650 lithium battery pack capacity measurement method steps:
1. Simple method of constant resistance discharge. You need to use a multimeter and a high-power resistor. First, fully charge it. You can use a landline charger, such as on your phone or phone. To fully charge the battery and connect the load to this resistor, typically a 10 ohm 5W cement resistor can be used for discharge until the voltage drops below 2.75V, resulting in a total discharge time capacity of 0.37A * time. This method is relatively simple, but there is some error involved.

2. Formal method: Using a lithium battery capacity tester, first charge to 4.20V, then let it sit for 1 hour for constant current discharge. The arbitration method is to discharge at a rate of 0.2, for example, with a capacity of 1000mAh, and discharge at a constant current of 200mA until 2.75V is reached. Calculate the time * constant current=battery capacity. This is done according to the national standard 18287 for lithium batteries. If it is a nickel hydrogen battery, similarly, the charging method is not constant voltage, and the discharge is up to 1.0V per cell. This method requires specialized equipment.