Instructables explains how you can take all your used-up batteries and get big money for them — by paying attention to the international scrap market:
“The market goes up and down. Right now the dollar is low and China and India are buying scrap like crazy to sell it back to us as products. That drives up scrap values. Our military shooting bullets at villages all over the world doesn’t hurt the value of lead either.”
More at the link.
As for the author of the article, he had an ATM at the scrap center spit out $100 bills at him. Now that’s the type of eco-friendly thinking that actually pays off.