Any power supply has a certain internal resistance more or less. In order to improve the load capacity, we hope that the internal resistance of the power supply should be as small as possible.

The resistance r is the internal resistance of the car battery, and RL is the load, which is in series with the internal resistance r of the battery, and the current flowing through r is equal to the load current. Assuming that the size of r remains constant, the greater the load current, the greater the current flowing through the internal resistance r, and the higher the voltage across r, thus reducing the voltage across the load RL. If the internal resistance If the voltage drop is too large, it may even cause RL to fail to obtain the rated working voltage and fail to work normally. Therefore, we hope that the internal resistance of the battery should be as small as possible, so that when driving a heavy load, there will be no obvious voltage drop on the internal resistance.

The internal resistance of the battery will increase with the increase of the use time, especially for the battery that is about to be scrapped, the internal resistance will increase significantly. When a large current load is applied, a large voltage drop will occur on the internal resistance, thereby reducing the voltage at both ends of the load.

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