Why should we avoid mixing batteries when using carbon zinc battery?

When using batteries, using batteries correctly and safely is an important cornerstone to ensure stable operation of equipment, extend battery life and maintain user safety. For carbon zinc battery, a frequently mentioned and important precaution is to avoid mixing batteries.
Definition and risks of mixed batteries
Mixing batteries refers to combining old and new batteries, batteries of different brands, models or capacities. This practice seems simple, but it actually hides considerable risks. Because the voltages of different batteries may be different, mixing them will cause the voltage of the entire battery pack to be unstable, which will affect the normal operation of the equipment. The internal resistance of the battery may also vary depending on the brand, model and capacity, which will cause the battery to produce an uneven current distribution during discharge, accelerate battery loss and even cause malfunctions.
In-depth analysis of the hazards of mixed batteries
Degraded equipment performance: Voltage instability will directly affect the operating efficiency of the equipment, which may cause the equipment to malfunction, respond slowly or make frequent errors. This effect is particularly significant for precision electronic instruments.
Shortened battery life: Unbalanced current distribution will accelerate the chemical reaction rate of the battery, causing rapid changes in the internal structure of the battery, thereby shortening the battery life.
Increased safety risks: In some cases, mixing batteries may also cause safety problems such as battery overheating, leakage, and even explosion. Although this situation is relatively rare, once it happens, the consequences will be disastrous.