Consumer Reports has a handy guide to help you do right by the environment and the law.
Tip number one is, ideally, you should not toss old batteries into the garbage.
In some places, it's illegal to throw batteries in the trash. So, whether it's your standard alkaline AA battery, a rechargeable cell phone battery, or the battery from your car, you should treat it with care by using safe storage and disposal methods because most batteries contain toxic ingredients like cadmium, lead, lithium or sulfuric acid.
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"Batteries can leak, get into the ecosystem and into the groundwater. So you really are concerned about that," said James Dickerson of Consumer Reports
And while old batteries may not generate enough energy to power a device, but they could still spark a fire if they're not handled carefully. You should store them in a secure container that keeps them lined up side-by-side, so the contact points can't touch each other or brush up against anything that's metallic or conductive.
Or another thing you can do:
"Put a little piece of tape on both the positive and negative ends. That makes sure that you don't end up having short circuits or any other type of current coming from the batteries," explained Dickerson.
An even better option?
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"Keep the container that you received the batteries initially in. And put them back in," he said.
Many businesses have battery recycling programs and stores like Best Buy, Lowe's, and Staples will take certain kinds of batteries as well.
Also check with your city or township many host events to collect batteries along with other hazardous waste and electronics and some also have permanent drop-offs.