It refers to the resistance of current flowing through the battery when the battery is working. Consists of ohmic internal resistance and polarization internal resistance. If the internal resistance of the battery is large, the working voltage of the battery will be reduced and the discharge time will be shortened. The internal resistance is mainly affected by the battery material, manufacturing process, battery structure and other factors. It is an important parameter to measure the performance of batteries. Note: Generally, the internal resistance in the charging state is taken as the standard. The internal resistance of the battery shall be measured with a special internal resistance meter instead of the ohm range of a multimeter.
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