Household batteries contain chemicals like potassium hydroxide that can cause respiratory, skin, and eye irritation. Nickel-cadmium batteries contain cadmium which can lead to osteoporosis, liver damage, and kidney failure. The US consumes 3 billion batteries per year, but 2/3 of battery waste ends up in landfills and can poison water supplies. A survey found that 80% of respondents buy household batteries but 91% dispose of them in normal trash bins, though 96% believe battery recycling is important.