Several battery types do not contain mercury. These include alkaline batteries, lithium-ion batteries, nickel-cadmium (NiCd) batteries, and nickel-metal hydride (NiMH) batteries. Understanding the various battery types that do not contain mercury can provide insights into their compositions and uses, as well as their environmental implications.
Mercury content in batteries varies significantly based on the type of battery. Alkaline batteries may contain very low or no mercury, while some older types, like button cell batteries, can contain about 1-25% mercury by weight. In general, the mercury content in these batteries has decreased due to environmental regulations.
Mercury-free silver oxide batteries, mercury-free zinc air batteries, lithium batteries are a commonly available alternative for button batteries. Global availability of mercury free zinc air and silver oxide buttons cells has substantially increased. Many manufacturers now provide these battery types mercury free.
These batteries contain mercury in small amounts (typically 0.1-2%) and the purpose of mercury in the cell is to prevent the build-up of hydrogen gas. The mercury acts as a barrier to the production of hydrogen and as such prevents the cell swelling and becoming damaged.
Alkaline batteries contain small amounts of mercury due to the chemical reactions involved in their production. Mercury was often used to stabilize the batteries and prevent corrosion. However, the use of mercury in alkaline batteries has significantly decreased since the late 1990s.
However, since regulations like the Battery Act of 1996, manufacturers have reduced mercury levels, and many newer models are mercury-free. The National Safety Council has raised concerns about the potential hazards of these small batteries if ingested, particularly by children.
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