Lithium-Ion Battery Fires at MRFs: The Affordable Way to Stop Them in Seconds

WatchDog Robotics  ·  September 30, 2026

Lithium-ion batteries hidden in household recycling and trash are now the leading cause of fires at materials recovery facilities, transfer stations, and scrap yards. A robotic fire nozzle can find a battery fire, aim at it, and put water on the seat of the fire in seconds. Remote monitoring is available (for on-site monitoring). It is not a required monthly subscription, and that is where most of the cost difference comes from.

The problem your crew already knows

Ask any MRF supervisor about hot loads and you will get a story. A vape pen crushed in the packer truck. A power-tool pack punctured by a loader bucket. A laptop battery that makes it past pre-sort, gets pinched in a disc screen, and starts smoking on the container line. None of these are rare anymore.

The public numbers match what the floor sees. Monthly fire reports published in Waste360 counted 448 publicly reported fires at U.S. and Canadian waste and recycling facilities in 2025—a record, above the prior year’s 430 and nearly 25% above the long-run annual average of about 360.

2026 is still a high-fire year. February was the worst February since tracking began in 2016. Through August the count stood at 293 fires, the third-highest January-to-August total on record, behind 300 in both 2024 and 2025. The more important figure is severity: 74 of those events were classed as catastrophic losses—already more than in all of 2024.

Those are only the fires that made the news. A 2024 analysis by the National Waste & Recycling Association (NWRA) and Resource Recycling Systems (RRS) estimated more than 5,000 fires a year at U.S. single-stream MRFs alone—more than 18 per facility—with lithium batteries as the primary ignition source.

Most of those events are small. A spotter sees smoke, someone grabs an extinguisher, the line restarts. The trouble is the handful that are not caught in time. The same NWRA/RRS work found that more than 1% of MRFs suffer a catastrophic loss every year, those losses average about $22 million, and the rate of catastrophic losses climbed 41% over five years. EPA’s 2021 review of battery fires in waste management documented 245 lithium-ion-linked fires at 64 facilities from 2013 through 2020, in 28 states and all ten EPA regions, with a steep year-over-year climb over that period.

Why battery fires are different from a pit fire

A damaged lithium-ion cell does not need an outside spark. Once it is punctured or crushed, it can heat itself, vent flammable gas, and throw heat into the cells next to it. Buried in cardboard, film plastic, or mixed paper, that small event has plenty of fuel.

Three things make these fires hard on a site manager. They start anywhere, including deep in a pile or inside a conveyor transfer point where nobody is standing. They grow fast because the surrounding material is dry and loosely packed. And they re-flash. A pack that looks knocked down can reignite minutes later, which is why a one-and-done response often is not enough.

Overhead sprinklers were not designed for this. They wait for ceiling heat to fuse a head, which in a high-bay building can take minutes, and then they wet a whole zone rather than the burning spot. By the time they open, the fire has usually spread past the point of origin. Water on balers, screens, and electrical panels adds to the downtime.

In a battery fire, the first minute usually decides whether you lose a few yards of conveyor belt or the building.

How a robotic nozzle responds

WatchDog Robotics’ NozzleBot™ is an autonomous robotic fire suppression system built for these environments. Infrared flame detectors and thermal cameras scan the protected area continuously. When they confirm a fire, the control software calculates its position and a robotic nozzle swings to it and applies water directly to the seat of the fire, typically within 5 to 15 seconds of detection.

When the fire is out, the system shuts off and returns to ready. If a battery re-flashes, it sees it and goes back to work. That matters for lithium-ion events, where cooling the pile and staying on watch are both part of the job. Because water goes only where the fire is, there is far less collateral damage to equipment, electrical gear, and saleable bales.

The platform behind NozzleBot has more than 300 deployments worldwide.

A person in the loop is an option, not a monthly bill

Some automated suppression systems on the market are built around a remote monitoring center. Every alarm is routed to an off-site operator who reviews the camera feed and decides whether to discharge. That model works. The facility also pays for it every month for the life of the contract, because someone has to staff that center 24 hours a day. It adds a step between detection and water on the fire.

NozzleBot does not depend on that step. It makes the suppression decision itself using multi-sensor confirmation, so no outside party has to be watching for the system to work at 3 a.m. on a holiday weekend.

Plenty of operators still want eyes on the system, and that is supported. Staff can view cameras and take manual control from a mobile app, joystick, or secure network connection. You choose how much oversight you want and who provides it. Your own team can do it. You are not locked into paying a third party.

Cost comparison

Cost factor	Mandatory remote-monitoring model	WatchDog NozzleBot
Who decides to discharge	Off-site operator reviewing video	The system, automatically; your staff can override
Recurring monitoring fee	Required for the life of the contract	None required
Human oversight	Built in, and billed	Optional, and in-house if you want it
Works if connectivity drops	Depends on the link to the monitoring center	Yes. Decisions are made on site
Response time	Detection plus operator review	Typically 5–15 seconds, detection to water

Over a multi-year term, cutting the mandatory monitoring subscription is usually the largest line-item difference between the two approaches. In WatchDog’s side-by-side proposals, five-year cost of ownership regularly comes in 40% or more below monitored-subscription systems.

The capital cost of the hardware is only part of the decision. Ask every vendor for a five-year total that includes monitoring fees, service contracts, and water-supply work. That is the number that shows up in the operating budget year after year.

Where to protect first

You do not need to cover every square foot on day one. Most facilities get the biggest return by starting where batteries get crushed, punctured, or buried:

• Tipping floor and push walls, where loaders break open bags and packs get damaged.

• Pre-sort, infeed conveyors, and transfer points, where material piles up and is hard to see into.

• Shredders, balers, and screens—the high-energy equipment most likely to rupture a cell.

• Bale storage and outdoor bunkers, which sit unattended overnight and on weekends.

NozzleBot’s trailer-mounted Defender configuration can also cover temporary or changing layouts, such as seasonal overflow storage or a transfer-station floor that gets reorganized often.

What insurers are asking for

Insurers have noticed. NWRA and RRS found MRF property insurance rates have risen from less than 20 cents per $100 of insured value to as much as $10. Underwriters increasingly want to see engineered controls, not just extinguishers and a written hot-load procedure.

Autonomous suppression gives your broker something concrete to put in front of the carrier. FM Global’s Data Sheet 4-14, published in April 2026, is the first FM data sheet devoted to automated monitor systems. It recognizes them as a compliant alternative to conventional overhead sprinklers in the applications it covers. Actual premium impact depends on your carrier and your site, so confirm with your broker. A documented, standards-backed system is a far stronger position than “we train our spotters.”

The bottom line for site managers

Lithium-ion batteries are not going to stop showing up in the waste stream. Public education helps, and producer-responsibility programs may help more over time, but the packs are already on your floor today. The practical question is how fast you can put water on a battery fire and what it costs to keep that protection running.

A robotic nozzle answers both. It finds and fights the fire in seconds, keeps watching for a re-flash, and does not require you to pay someone else to watch it. If you want a person in the loop, you can have one. You just do not have to.

Frequently asked questions:

What is an autonomous robotic fire suppression system?

It pairs infrared flame detection and thermal imaging with a robotic nozzle that locates a fire, aims at it, and applies water directly to it within seconds, then shuts off automatically. WatchDog Robotics’ NozzleBot™ is one of these systems.

Do these systems need a person watching 24/7?

Not NozzleBot™. It detects, targets, and suppresses on its own. Remote viewing and manual override are available if you want them, but they are not a required monthly service.

Can water put out a lithium-ion battery fire?

Water is the most practical agent for battery fires in mixed waste because it cools the cells and the material around them, which slows thermal runaway. Batteries can re-ignite, so a system that keeps watching and re-engages matters as much as the first discharge.

How many fires happen at recycling facilities each year?

Waste360’s monthly reports counted a record 448 publicly reported fires at U.S. and Canadian waste and recycling facilities in 2025. Most fires never make the news. NWRA and RRS estimated more than 5,000 fires a year at U.S. single-stream MRFs alone, with lithium batteries as the leading cause.

Where should protection go first?

The tipping floor, pre-sort and infeed conveyors, shredders and balers, bale storage, and outdoor bunkers. Those are the areas where damaged batteries are most likely to ignite and least likely to be seen right away.

See what protection costs for your site

WatchDog Robotics will map your highest-risk zones and give you a five-year cost comparison, with monitoring fees included, so you can see the real numbers.

Request a site assessment at WatchDogRobotics.com or call (307) 231-0416.

Sources

•         Waste360 monthly waste and recycling facility fire reports, including January 2026, January–February 2026 fire data, and the September 2026 Fire Report (Ryan Fogelman).

•         National Waste & Recycling Association and Resource Recycling Systems, Lithium-based Battery Fire Threat to U.S. Single Stream Material Recovery Facilities (2024).

•         U.S. EPA, An Analysis of Lithium-ion Battery Fires in Waste Management and Recycling, EPA 530-R-21-002 (July 2021).

•         FM Global, Property Loss Prevention Data Sheet 4-14, Automated Monitor Fire Suppression Systems (April 2026).

•         WatchDog Robotics, NozzleBot Overview & Cut Sheet.

Response times reflect typical detection-to-discharge performance and vary with installation geometry and fire conditions. Cost comparisons are based on WatchDog proposals and will vary by site. Insurance outcomes are carrier- and facility-specific. Public fire counts cover reported incidents only and understate total events.