Vehicle (lead acid) and household (dry cell) batteries contain hazardous chemicals. Improper disposal can cause serious environmental harm. Look for solar powered products, or use an AC / DC adapter o avoid the use of batteries. Rechargeable Nickel-Cadmium batteries can be used many times and will save you money. Recycle all batteries when they are no longer useable. Any store that sells auto batteries will accept lead acid batteries for recycling. These batteries are reprocessed to reclaim the lead, sulfuric acid and plastic casings. You can find a location to recycle dry cell batteries, button batteries, and rechargeable batteries, at http://www.call2recycle.org/ You can also recycle both vehicle and dry cell batteries at any Snohomish County Solid Waste Facility.