The Hidden Dangers of Batteries in the Trash - And How to Dispose of Them Safely

From smartphones and cordless tools to greeting cards and children’s toys, batteries power much of our daily lives. But when those batteries reach the end of their life, many people don’t realize that tossing them into the household trash or recycling cart can lead to very real dangers. Whether it’s an alkaline AA battery from a TV remote or a lithium-ion battery from a laptop, all batteries pose fire risks when they’re not disposed of properly.

Why Batteries in the Trash Are So Dangerous

Batteries may look harmless, but inside each one is a powerful source of stored energy. When they end up in trash or recycling carts, that stored energy can be accidentally released. This often happens when batteries are crushed, punctured, or compacted inside collection trucks or at waste and recycling facilities.

A Spark That Can Ignite a Fire

Lithium-ion batteries are especially unstable. If damaged, they can go into thermal runaway, generating intense heat that can start fires in seconds. These are the same types of batteries that have caused well‑publicized fires in phones and e‑bikes — and they behave no differently when thrown away.

But the danger isn’t limited to lithium batteries. Other household batteries — including alkaline, nickel-cadmium (Ni-Cd), and nickel-metal hydride (NiMH) — can also short-circuit or rupture under pressure. Even “dead” batteries often contain enough residual charge to spark when they come into contact with metal or other batteries.

Waste and recycling facility operators are seeing dangerous incidents increase, including “smolder events” deep inside loads of trash and full-scale fires sparked by damaged batteries. What starts as a single battery tossed into the trash or recycling can lead to facility shutdowns, equipment loss, and severe safety risks for workers and firefighters.

Understanding the Risk in Collection Trucks

Garbage and recycling collection trucks compact tons of material every day, and that process in the truck increases the risk of fire. While the exact cause of any single fire isn’t always known, batteries are a known common ignition source in the waste industry, and they remain one of the most preventable hazards.

Fire crews and waste operators regularly report that batteries found in the waste stream can be damaged when compacted in the truck, potentially leading to smoldering, flare-ups, or full-scale fires. Even when the cause of a specific truck fire can’t be confirmed, the risk of battery involvement is well documented across the industry.

The message is simple: keeping batteries out of trash and recycling carts significantly reduces the likelihood of these dangerous events.

So What Should You Do With Household Batteries?

The good news is that safe disposal options are widely available. Instead of putting batteries in trash or recycling carts, residents can use designated drop‑off sites and community hazardous waste programs.

Safe Disposal Resources

• Find local battery drop-off locations here.
• Batteries Plus Directory
• Battery safety education:
  https://batterysafetynow.org/
• More information about lithium battery disposal here.

Proper disposal ensures batteries are handled by professionals trained to manage their risks. It also keeps valuable materials in the recycling system — and keeps dangerous fires out of our trucks and facilities.

Attend the Household Hazardous Waste Event

If you’ve been collecting old batteries in a drawer — or if you have devices containing batteries that you no longer use — the upcoming Household Hazardous Waste event is the perfect time to dispose of them safely.

Bring your:

• Alkaline batteries
• Lithium-ion batteries (from electronics, tools, vape pens, etc.)
• Nickel-metal hydride (NiMH) batteries
• Nickel-cadmium (Ni-Cd) batteries
• Any household device containing a battery that can’t be easily removed

This event offers a convenient and environmentally responsible way to protect your home, your community, and local waste workers from the hazards of improper battery disposal.