RECYCLE IT! Batteries contain toxic heavy metals like mercury. After your battery is spent make sure it ends up in the right hands, not in the regular trash! In Oakland you can put them in a ziplock bag and set them on top of a trash bin for curbside pickup. More info: http://www2.oaklandnet.com/government/o/PWA/o/FE/s/GAR/OAK024385 From any town: Home Depot or RadioShack as well as other businesses take batteries for recycling – even spent rechargeable batteries. Find your closest battery recycling drop off: http://www.call2recycle.org/locator/