We're becoming more and more of a cordless world when it comes to our electronic devices, smartphones, e-readers and tablets. Most of these products use something called a lithium-ion battery (or li-ion), which is rechargeable. But over time, a rechargeable battery needs to be replaced and should never be thrown in the trash. The nonprofit Call2Recycle has thousands of collection boxes that will accept them for free; you can find them in stores like Lowe's, Home Depot and Best Buy. Just place batteries from phones, cordless power tools, digital cameras, two-way radios, laptops and e-readers inside, and they'll be recycled for free.