Why Most Fire Extinguishers Won't Save Your EUC, Onewheel, or E-Bike (And What Just Might)

We sat down with Shane Bentley, one of the founders behind FCL-X, a lithium-specific fire suppression agent with over 100 years of combined firefighting experience behind it, to talk about what really happens when a lithium battery goes into thermal runaway. What we learned changes how we think about rider safety.

If you own a Onewheel, an electric unicycle, an e-bike, an electric scooter, or any personal electric vehicle with a lithium-ion battery, you've probably told yourself some version of this: "That won't happen to me."

Maybe it won't. But if it does, are you actually prepared?

We recently had a long conversation with Shane Bentley, one of the co-founders at Full Circle Lithium, a company that has spent the last two years burning thousands of lithium batteries, funding half a million dollars in third-party testing, and building what may be the most validated lithium fire suppression product on the market - FCL-X. The conversation was eye-opening, and a few things Shane said are going to stick with us for a long time.

Here's what every PEV rider, whether you're on a Onewheel, EUC, e-bike, or electric scooter, needs to understand.

Lithium Fires Are Not Like Other Fires

When a lithium-ion battery goes into thermal runaway, it isn't just on fire. It's in the middle of an uncontrolled chemical chain reaction, generating its own heat, releasing toxic hydrogen fluoride gases, and venting at temperatures that can exceed 900°F. The battery doesn't need oxygen to sustain the reaction. In fact, water, the most common first response to fire, can actually accelerate the problem.

"Water will cool it. Water will take the fire away. But as soon as you stop spraying water on it, guess what happens? It reignites. It comes right back." — Shane Bentley, Co-Founder, FCL-X

This isn't a theory. We recently spoke with Jerry Bloodworth, a rider who lost over $200,000 in property damage to a lithium fire. Four hours after the fire department left, the battery reignited. The fire department had used water.

The Hard Truth About Common Extinguishers

Most riders, and even most first responders, reach for what's familiar when a fire starts. But not all extinguishers are equal when it comes to lithium batteries.

ABC dry powder extinguishers may actually cause a violent reaction with lithium-ion cells, similar to what happens when water hits burning magnesium. Not ideal.

F-500 and similar encapsulators have been popular in the fire service for years, but they contain nothing that can neutralize the chemical reaction happening inside a lithium battery. They work on Class B fires (gasoline, fuel vapors) by excluding oxygen. Lithium doesn't need oxygen to burn.

"F-500 did really well manipulating the system for a long time. It doesn't work. It never will work." — Shane Bentley, Co-Founder, FCL-X

Vermiculite-based products (like E-Fire-X) can help exclude oxygen and reduce heat after a battery has fully burned through its fuel load. But during active thermal runaway, the heat of the battery breaks the vermiculite down before it can do much good.

The reason nothing conventional works comes down to one thing: you need a product that can neutralize the chemical reaction with the lithium itself, not just remove oxygen or cool the surface.

"You've got to have something in your product to neutralize the chemical reaction. There's nothing out there that does." — Shane Bentley, Co-Founder, FCL-X

What Makes FCL-X Different

FCL-X is 99% water, but it's what's in that other 1% that matters. When it comes into contact with an active lithium thermal runaway event, it reacts with the lithium ions directly, rapidly dropping temperatures and helping neutralize the hydrogen fluoride gases released during the process.

In testing, Shane and his team observed temperatures drop from over 850°F to under 150°F almost immediately upon application. Unlike water, the reaction doesn't reverse when you stop spraying. In over 25 vehicle-scale burns across multiple EV manufacturers, FCL-X's team reports zero re-ignitions, and each battery has been shipped back to a recycler in a plywood box without incident.

FCL-X is UL listed as a Class A wetting agent and has been independently tested by SafeLabs, NC State, and certified to the Dutch NTA 8133 standard. Kia, according to Shane, once told them they'd never put out an EV battery. They disconnected the fire hydrant and did it anyway, with FCL-X.

Prevention Is Still Your Best Plan

No extinguisher replaces a good prevention strategy. Here's what Shane and the FCL-X team recommend, and what we're incorporating into our own educational programs at eRideLife. For a full breakdown of what to avoid, see our guide to the 8 most common lithium battery charging mistakes.

1. Designate a charging area. Ideally detached from your home, away from combustibles, and away from any egress points. If that's not possible, choose the most isolated area you can.

2. Don't charge unattended. The majority of serious lithium fires happen when a device is left charging overnight or without supervision. If you can't be present, a timer-controlled smart outlet can cut power automatically after a set period.

3. Add early detection. A smart heat and smoke detector with SMS alerts to your phone can notify you before a situation becomes catastrophic. Some systems can communicate directly with the outlet and cut power if a temperature spike is detected.

4. Know your battery's condition. Dropped your wheel in a river? Crashed hard? Bought a used device without full service history? Damaged or compromised batteries are one of the most common causes of failure. When in doubt, have it inspected.

5. Have a plan. Know where your extinguisher is, know how to use it, and make sure everyone in your household does too. Overwhelm is real: studies suggest most people don't deploy an extinguisher even when one is present, because they freeze under pressure.

"You've got to have a plan and you've got to be educated to be able to have a plan." — Shane Bentley, Co-Founder, FCL-X

If Something Does Go Wrong: Access Is Everything

If you're dealing with an active lithium fire, your goal is to get FCL-X into the battery, not just onto it. The product needs to reach the cells where the thermal runaway is happening.

For most PEV batteries, this means directing your stream toward the vent point, wherever the battery is venting gas and heat. Once a battery case ruptures, that rupture point becomes your access. Get as much product inside as you can.

For the batteries most common in high-performance EUCs, Onewheels, and e-bikes (21700 cells, 150V+ systems, packs from 2400 to 4400+ watt hours), Shane recommends the 3-liter FCL-X extinguisher over the 2-liter, primarily because it includes a hose that lets you direct the stream precisely and maintain some distance while you work. Smaller builds like entry-level Onewheels or compact e-scooters may be adequately covered by the 2-liter, but the extra volume is cheap insurance. The extra volume also gives you margin if access is difficult.

For repair shops or anyone storing multiple battery systems, the 9-liter is the appropriate scale.

The Bottom Line

Your Onewheel, EUC, e-bike, or electric scooter is likely one of your most valued possessions. The knowledge to protect it, and your home, doesn't cost much, and it could matter enormously. As Shane put it: if someone just spent $4,000 to $5,000 on a wheel, the cost of a quality extinguisher and a smart charging setup is a small price to pay.

We're partnering with FCL-X to bring weekly lithium fire safety webinars to the PEV community, covering everything from charging setup to what to do in an emergency. Stay tuned, and in the meantime, explore our lithium fire safety products to make sure you're prepared.

Safety Disclaimer: This article is for educational purposes only. In any fire emergency, call 911 immediately. Only attempt to suppress a fire if it is small, you have a clear and unobstructed exit behind you, you are not exposed to toxic gases, and you have the correct equipment. Never place yourself or others at risk to save property. If conditions are unsafe or the fire is growing beyond your control, evacuate immediately and leave firefighting to the professionals.

Note: FCL-X is a UL listed Class A wetting agent. It is not rated as a Class C (electrical) extinguisher and should not be used as a substitute for code-required ABC extinguishers in commercial or residential settings where such extinguishers are mandated by ordinance or code. Always follow proper safety protocols and consult a professional for your specific situation.