Check with your city or county to see if they have a household waste disposal service. You should be able to dispose of used batteries as well as any other nasties that shouldn't really go in the landfill. We just took some stuff today to the city maintenace yard to be disposed of and we were told that there is a new regulation that you have to tape the ends of each battery with masking tape. Not sure if that is just a local thing or what, we're in California.
Mama to Paisley (3/07) & Violet (12/10) and wife to my Piggy-love.