AA, AAA, C, D and 9 volt batteries , alkalai and rechargeable can be disposed of at your local Hazardous Waste Facility. Usually your municipal services office can tell you where to go. Some electronics retailers will take used batteries for recycling or disposal. Batteries contain toxic chemicals and should not be thrown in the garbage.
Drop it off at home-depot or radio shack. label a large plastic sandwich bag and hang it up somewhere and use it as an old battery collection bag. You NEED to get involved. Don't just trash it like some douchebags.