Batteries, both the kind that you toss after one use and the kind you can recharge and reuse, have become everyday essential tools. With all this consumption comes a great deal of waste. Which portable power is best? Read on.

Single-use batteries are less expensive, but are considered more wasteful because such a large quantity are used. Rechargebles are thought to save money over the life of each battery, even though they are initially more expensive. They also contain a great deal of heavy metals, which could lead to more contamination if not recycled. The more harmful the metal, the more likely you’ll be able to find a recycler because of state and federal laws. Call2Recycle is the only free rechargeable battery and cellphone collection program in North America, partnering with retailers for mail-in programs. All of the materials collected through the Call2Recycle program are recycled and used to create other types of materials, including new batteries and scrap metal.

“When choosing between single-use and rechargeable batteries, you should consider the value and expected life of the product the batteries will power,” according to Carl Smith, president and CEO of Call2Recycle. Higher-tech tools such as digital cameras and cellphones need rechargeable; remote controls and smoke detectors, single use.

These tips come from Earth911.com via Pennsylvania College of Technology’s Energy Conservation Subcommittee.