Batteries can no longer be recycled curbside.
I just called up the Mercer County Improvement Authority, and they confirmed that alkaline batteries are safe to put in the garbage. They had no suggestions about how to recycle them. As stated on Princeton Township's website (www.princetontwp.org/n99insert2.html), rechargeable batteries can usually be recycled at your local Radio Shack or other similar store. For other sorts of batteries, you may want to consult the Mercer County website (http://www.mcia-nj.com/recycling.html). Our elementary school was collecting batteries for awhile--something to keep an eye out for.