While lithium batteries are the most powerful household batteries available, they are not rechargeable, are highly toxic, and expensive. This means that disposal of the battery is inevitable and it also means that it cannot be thrown in the regular trash; in landfills, the toxic chemicals in the batteries can corrode the metal and seep into the ground resulting in soil and groundwater contamination. They are the best for smoke detectors because they have such long life spans in the 9 volt size (around 10 years), but for other sizes they are not as good as rechargeable Nickel-Metal Hydride (NiMH) batteries.
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