1,These Zinc-Chloride Batteries are the first widely used household batteries. 2,They are 0.00% Mercury and Madmium, reliable p Zinc-Chloride Batteries are the first widely used household batteries.They are 0.00% Mercury and Madmium, reliable performance.Rated at 1.5 volts per cell, they are much lower in cost compared to alkaline, but also have a lower energy density.