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What are the causes of Panasonic battery return phenomenon?

Many people have seen Matsushita Battery. Do you know the reasons for the phenomenon of Panasonic battery returning? Here is a detailed introduction:
The reverse polarity of Panasonic battery means that the positive and negative poles of the battery have changed. The phenomenon of reverse polarity is reflected in two aspects. One is that when the lead-acid battery is assembled and assembled, a single cell battery group is connected reversely or the whole battery group is reversed. In this case, the phenomenon that the terminal voltage is less than the sum of the rated voltage of each monomer Panasonic battery or the terminal voltage is negative will appear when the lead-acid battery is filled with acid. On the other hand, when the lead-acid batteries are used in series, the capacity of a battery (or a single battery) is low or completely lost. When discharging, the battery is quickly discharged and recharged by other batteries, making the original negative electrode become positive, the original positive pole becomes negative, and the terminal voltage appears negative.
For the former reverse polarity fault, when measuring the terminal voltage of Panasonic battery (battery composed of several single batteries), it can be found that if there is a single battery with reverse polarity, not only the 2V voltage of the battery will be lost, but also the 2V reverse voltage will be increased, and the terminal voltage will be reduced by about 4V. For example, for a battery with a rated voltage of 12 V, if the terminal voltage is about 8 V, there is a single cell reverse pole. If the measured terminal voltage is about 4 V, there are two single cell reverse poles; if the terminal voltage is about - 4 V, it means there are four single cell reverse poles; if the terminal voltage is - 12 V, it means that all six single cell reverse poles are.
For the latter, the terminal voltage (negative value) varies with the discharge. Generally in the detection, for this case, the battery should be removed from the discharge circuit in time to avoid damage to the Panasonic battery.

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