What are the hazards of mixed use of batteries in series

　　What are the hazards of the mixed use of batteries in series?

　　 In the use of batteries, sometimes new and old batteries are used in series. As everyone knows, this practice will shorten the service life of the batteries. . Because there are more chemical reaction substances in the new battery, the terminal voltage is higher, and the internal resistance is small (the internal resistance of the new 12V battery is only 0.015-0.018Ω); while the terminal voltage of the old battery is low, and the internal resistance is relatively large (the 12V old battery’s internal resistance is only 0.015-0.018Ω). The internal resistance is above 0.085Ω).

　　 If the new battery and the old battery are mixed in series, the charging voltage at both ends of the old battery will be higher than the charging voltage at both ends of the new battery in the charging state. As a result, the new battery is not fully charged yet. The charge of the old battery has long been too high; in the discharging state, the charge capacity of the new battery is larger than that of the old battery, resulting in over-discharge of the old battery and even reverse polarity of the old battery. Therefore, the new and old batteries must not be mixed.

　　 In addition, batteries with different charge capacities cannot be mixed in series, because when two batteries with different charge capacities are used in series, they tend to overcharge or discharge batteries with small charge capacities. , Shorten its service life. Battery

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