NEW YORK: When household batteries die, it's hard to know what to do with them. So they get shoved into a junk drawer or sheepishly thrown into the trash.
But dead batteries aren't quite finished. They can leak heavy metals like cadmium and nickel into soil and water once they reach the landfill. Some of them can also overheat and cause fires in garbage trucks and recycling centres.
The good news is, safely disposing of your batteries takes just a few steps. They'll get shipped to recycling centres that break down their contents to make new things.
Battery recycling processes could use some fine-tuning, but it's still a simple and responsible way to get rid of them.
Recycling old batteries "keeps you safe, keeps the waste industry safe, keeps the first responders safe and responsibly sees that battery reach a proper end of life,” said Michael Hoffman, president of the National Waste and Recycling Association.
Batteries keep things running in our homes, powering everything from alarm clocks and TV remotes to gaming controllers. Millions are bought and used every year in the US, according to the Environmental Protection Agency.
They leave their stamp on the environment at nearly every stage of their life span.
Many of the materials used to make batteries – elements like lithium and nickel – are mined. Over half the world’s cobalt reserves are in Congo.
Once mined, those materials are shipped around to be refined, fashioned into a battery and packaged for sale. All the ships, trucks and planes moving them add to batteries' carbon footprint. Making the batteries can release carbon emissions and pollution into the air and atmosphere, too.
Though household batteries are far smaller than the big ones that power EVs and electric bicycles, there are a lot more of them and it’s worth figuring out how to get rid of them.
"One person’s single battery is not necessarily a lot,” said environmental scientist Jennifer Sun with Harvard University. "But everyone uses many batteries."
Recycle batteries at a registered drop-off site
To begin, wrangle your old batteries and figure out what kind they are. Batteries "come in all shapes and sizes, but what’s inside differs,” said materials scientist Matthew Bergschneider of the University of Texas at Dallas.
Alkaline and zinc-carbon batteries are generally single-use and come in AA, AAA and more. These can be safely thrown in the household trash in most places, but the EPA still recommends recycling them so that their materials can be made into something new.
Lithium-ion batteries – commonly found in things like power tools and cordless vacuums – are a risk to cause fires and leak toxic gases in garbage trucks and landfills. A lot of rechargeable batteries are lithium-ion, but more single-use batteries are being made this way too.
Have a location in your home to collect the batteries over time and then "at some point, hopefully among all the other things that we all have in our lives, you can find a convenient drop-off location,” said Todd Ellis of The Battery Network.
If your batteries look swollen, cracked or are leaking, don't drop them off. You'll need to get in touch with your local recycling centres to figure out how to turn them in.
Recycled batteries can have a second life
Once batteries are dropped off at a collection site, they're sorted by type and taken to a recycling facility where they're broken down into their essential components – like cobalt, nickel or aluminium. Some bits can be used to make new batteries or other things. Nickel, for example, can be used to make stainless steel products and alkaline batteries can be turned into sunscreen.
Safely recycling a battery doesn't cancel out the environmental cost of making it. But it does give the battery's components their best chance at becoming something new.
"You continue to recycle and you don’t have to go back to the Earth to mine,” said public health expert Oladele Ogunseitan, who studies electronic waste at the University of California, Irvine.
Good battery habits are also good for us. It protects against old or damaged batteries leaking toxic compounds into our cabinets and junk drawers.
"I think it’s one of the simplest and most controllable actions that we can take to reduce our impact,” said Sun, the Harvard scientist. – AP
