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Why can't alkaline and carbon batteries be mixed?
- Jul 28, 2018 -

Since alkaline batteries and carbon batteries have different electrode structures and electrolytes, their operating voltages and storage capacities are different. In general, alkaline batteries have five to six times the capacity of carbon batteries, and higher discharge currents. 

In the parallel connection mode, the new battery has a higher voltage and the old battery has a lower voltage. When mixed, the new battery charges the old one and consumes the power inside the new one. In the serial connection mode, the internal resistance of the old battery becomes very high, but that of the new battery is small. When discharging, the new battery consumes power on the internal resistance of the old battery, and may even reversely charge the old battery. The reason why alkaline batteries and carbon batteries cannot be mixed is the same as the reason why old and new batteries cannot be mixed. If mixed, the battery will consume too fast and suffer a shorter service life or even leakage.

In addition, both alkaline and carbon batteries are disposable batteries that cannot be heated or charged; otherwise explosion may occur. If the appliance is not used for a long time, the battery should be taken out in time. After use, the power should be turned off to prevent the battery from discharging, resulting in an adverse chemical reaction inside the reactor.