Instead of throwing used batteries away, they should be recycled. I use a Ziploc bag and hang it from one of the keyhooks in our kitchen. Once the bag is full, we take them to our local hazardous waste facility for recycling. You can recycle cell phone batteries, alkaline batteries, etc. this way.
This also works for recycling plastic bottle caps. Most salons that carry Aveda products will take plastic bottle caps to be recycled. Check www.aveda.com for a salon near you. Then save the caps in Ziploc bags to take to salon when full. They take shampoo, salad dressing, milk jug caps, etc.