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Mercury-free batteries are currently safe to use and meet environmental protection standards. But the environment is the sole issue! Batteries are also contaminated with mercury and other heavy metals, and it is still harmful if it comes into contact with food or the mouth.
Unlike conventional dry batteries filled with solid paste, alkaline batteries' potassium hydroxide is a liquid, resulting in a low internal resistance. The amount of current generated is 3 to 5 times greater than that of regular dry batteries of the same volume because the zinc in the alkaline battery participates in the reaction as crumbs and has a large contact area with the electrolyte.
The dimension of all type D batteries is the same, although their normal capacities differ. It is high in the model in issue and reaches 19500 mAh in premium manufacturers. R20 capacity in saline is 8000, while HR20 in NiMH type is up to 11500. 1.5 volts of voltage. The manganese-zinc species have the same voltage.