Electric bikes are now a big part of California’s transportation system. People who ride them to work use them to avoid traffic jams, delivery drivers depend on them for gig economy jobs, and recreational riders like that they can go longer distances without getting tired. This rapid growth has led to a crisis: a sharp rise in lithium-ion battery fires, many of which happen in homes, apartments, and garages while bikes charge overnight.
Battery fires involving e-bikes are very different from regular electrical fires. They catch fire very quickly, are hard to put out even for trained firefighters, and make toxic smoke that is very bad for your health. From 2013 to 2023, there were 300% more lithium-ion fires in San Francisco alone, and over the course of ten years, the city lost more than $10.6 million in property damage.
Senate Bill 1271, which Governor Gavin Newsom signed on September 27, 2024, was California’s response to this growing threat to public safety. This law makes it necessary for third parties to get safety certification starting on January 1, 2026. This will change who can be held legally responsible when battery fires happen. If you’ve been injured in an e-bike battery fire, a best personal injury lawyer can help you understand your legal rights and pursue compensation for your damages.
This article talks about what the new law says, why getting UL 2849 certification is important, how liability standards will change after the 2026 deadline, and what injured consumers should know about their legal rights.
The Increasing Danger of Lithium-Ion Battery Fires
Why E-Bike Batteries Are So Dangerous
Lithium-ion batteries use flammable electrolytes to store a lot of energy in small spaces. This combination makes it possible for thermal runaway to happen, which is a chain reaction that keeps going on its own and causes the temperature inside to rise uncontrollably. The process starts when the heat that battery cells make is more than the heat that is lost to the outside world.
This causes a fast, violent fire. Fires can start up again hours after they seem to be out because damaged cells keep making heat. The pressure inside breaks open the cell casings, letting out poisonous gases that ignite nearby materials in a matter of seconds.
Where Fires Happen Most Often
Statistics show patterns that are worrying. Most e-bike battery fires happen inside apartments where bikes are charging overnight next to things that can catch fire. Garages are another high-risk place where bikes stored next to cars, paint, or chemicals can catch fire again.
The Los Angeles Fire Department said that there were 111 confirmed lithium-ion battery incidents in 2024. By June 2025, the number of calls had doubled. By the end of 2024, San Francisco had recorded about 15 high-intensity battery explosions. The first battery-related death in the city happened in 2023. Notably, several incidents involved batteries that weren’t charging or being used; they just failed on their own while they were stored.
Reasons Why Batteries Fail
Investigating fire events shows that the same things happen over and over again. Low-quality battery cells from unknown manufacturers have safety controls that don’t work consistently and separators that don’t work as well at lower temperatures as cells that are made correctly. Batteries that are not made by the manufacturer or are fake do not have functional battery management systems that should stop overcharging and thermal escalation.
Universal chargers that aren’t made for specific battery models can give the wrong voltage or not turn off when the batteries are fully charged, which can cause dangerous overcharging. Dropping or hitting something, using the wrong charging equipment, and storing something in very hot or cold places all make it more likely to fail.
What is UL 2849 Certification?
What UL 2849 Really Tests
UL 2849 is a safety standard for the whole system that is very different from testing just one part. The certification looks at the whole e-bike as a single unit, testing how the battery, charger, motor controller, and electrical wiring work together when everything is working normally and when something goes wrong.
The standard tests the battery management system’s ability to find voltage spikes, cells that aren’t charging evenly, and rising temperatures. It checks that chargers and batteries are communicating correctly so that charging stops or slows down when batteries are full. Testing the motor and controller shows that the drive units don’t draw too much current, which could damage the wiring or cause thermal failures. To keep people from getting shocked, especially when it’s wet, all of the wiring that connects to each other is tested for insulation resistance and dielectric strength.
In critical abuse tests, batteries are pushed to their limits by being overcharged to more than 110% of their rated voltage, short-circuited, cycled through extreme temperatures, hit with mechanical impacts that mimic crashes, and subjected to sustained vibration that mimics real-world cycling conditions.
The Most Important Difference Between UL 2849 and UL 2271
UL 2271 only tests the battery pack itself, not the whole device. It tests the battery and internal cells separately. This component-level approach is useful, but it doesn’t show how batteries can interact dangerously with other parts of the system.
Not all fires are caused by battery problems. Sometimes they happen because batteries and chargers don’t match, motor controllers draw too much current, or wiring isn’t strong enough to handle power loads. System-level testing in UL 2849 finds these interaction failures that testing only on components can’t find.
The Battery Safety Mandate in California for 2026
What Senate Bill 1271 Says
Starting on January 1, 2026, California will not allow the sale, lease, or distribution of e-bikes and battery systems that do not have safety certification from a third party. In California, all e-bike batteries must meet either the European standard EN 15194 or the UL 2849 standard. This rule applies to all new e-bikes, batteries bought separately, and all stores and websites that sell them in California.
The law says that products must always have a label with the name or logo of the accredited testing lab and the specific standard that the product meets. When asked, manufacturers, importers, and retailers must give copies of safety test reports that are true and accurate.
Rental fleet operators have more time to comply; all rental units must meet certification standards by January 1, 2028.
What the Law Doesn’t Do
In general, SB 1271 does not ban e-bikes or force people to return products they already own that were made before 2026. It is still legal to own bikes that you bought before the deadline that are not certified.
Why California did what it did
The response from the legislature dealt with a number of issues that were coming together. Fire departments said that the number of emergency calls about batteries was going up by a lot. Operators of multi-family housing wrote about terrible fires that spread through apartment buildings. Toxic smoke and the risk of reignition were new dangers for first responders. There was a huge rise in insurance claims for fire damage and injuries.
Without mandatory safety standards, there was a gap in regulation that allowed low-quality goods to enter the market through global digital marketplaces without checking their electrical safety or manufacturing quality.
How Liability Standards Will Change After 2026
Before 2026, product liability
Before the mandatory certification deadline, battery fire cases depended on showing specific defects through expert testimony, detailed forensic analysis, and showing how the product was made wrong. Defendants often said that failures were caused by user misuse, changes made after the product was sold, charging mistakes, or improper storage, not by defects in the product itself.
To prove that a battery was inherently unsafe, a lot of technical evidence was needed about the quality of the cells and how well the battery management system worked.
The Law After 2026
It is against the law in California to sell an e-bike battery that has not been certified after January 1, 2026. This violation of the law changes the legal analysis using the doctrine of negligence per se. California Evidence Code § 669 says that breaking a safety law meant to stop certain kinds of harm is a sign of negligence.
In battery fire cases after 2026, plaintiffs can prove negligence per se by showing that the defendant sold a battery that wasn’t certified, that the electrical system that wasn’t certified failed and caused the fire, that the fire caused the type of harm that the law was meant to prevent, and that the injured person is part of the group that the law was meant to protect.
Once these things are proven, the defendants have to show that they had good reasons for not following the rules, which is a very high bar to clear.
Why Certification Sets a Clear Legal Standard
After 2026, compliance will be either yes or no: products will either be certified or not. This gets rid of a lot of the technical problems that used to make battery fire lawsuits so complicated. As a matter of law, courts can more easily decide that products that don’t have the right certification were “unreasonably dangerous.” When statutory violations are the basis for liability, the burden of proof on injured consumers is much lower.
Finding people who might be responsible
Companies that make things
Companies that make batteries, supply cells, and put together the final product could all be held liable. Not getting the right certification, using parts that aren’t up to par, and not having enough quality control all make you liable.
Retailers and Distributors
In California, brick-and-mortar stores and online marketplaces that sell e-bikes must check for certification before making a sale. The required labeling makes it possible to check for compliance. Once retailers knowingly sell uncertified goods after the deadline, they can’t shift blame to manufacturers. If online platforms send unlabeled or unapproved batteries to California addresses without checking that the vendor is following the rules, they could be held responsible.
Importers and sellers with their own brands
Importers who bring e-bikes into the US just for distribution in California are directly responsible for making sure they meet certification requirements. Private-label sellers who sell goods under their own brands can’t easily get out of being responsible by blaming overseas manufacturers they chose. California’s chain-of-distribution liability applies to all businesses that make money by putting dangerous goods into the market.
Liability for Riders
You are not responsible for fires just because you own an e-bike. But the defendants may still say that the failures were caused by user misuse, like using chargers that obviously don’t work, keeping batteries in very hot or cold places, or continuing to use batteries that are clearly broken.
Injuries and damages caused by battery fires
E-bike battery fires cause very different injuries than regular house fires. If you get burned by direct flame contact or radiant heat, you may need to stay in the hospital for months, have skin grafts, and have surgery to fix the damage. Injuries from breathing in smoke include toxic chemicals like hydrogen fluoride, which turns into hydrofluoric acid when it comes into contact with moisture in the airways.
When batteries vent quickly, they can cause blunt force injuries like broken bones, cuts, and traumatic brain injuries. When secondary fires spread to homes or apartments, they destroy all of the property, force people to move, and destroy things that can’t be replaced.
A lot of the people who died weren’t on bikes when the fires started. Batteries that are charging overnight in bedrooms, stored in closets, or left unused in garages can fail on their own, hurting people who are sleeping, people who are nearby in other apartments, or first responders trying to save them.
How to Protect Your Rights After a Battery Fire
Taking quick action after an e-bike battery fire can help keep evidence that is important for proving who is at fault. Get medical help right away for any injuries, even if they don’t seem serious. Effects of smoke inhalation and internal injuries may not show up for hours or even days.
Keep the battery, bike, and charger; don’t throw away broken parts. These things are very important physical evidence for forensic analysis. Take pictures of all the damage, including the burn patterns on the bike, the damage to nearby buildings, the storage area, and any visible injuries.
Get reports from the fire department that describe the incident, the results of the investigation, and any conclusions about where it started and why. Find out the brand, model number, and seller of the product, and keep all of your purchase records, such as receipts, order confirmations, and warranty information.
Before you talk to a lawyer, don’t change, fix, or let anyone else look at the bike. Contaminating or destroying evidence makes it harder to do the technical analysis needed to prove causation. Don’t say you’re responsible or admit fault—many fires are caused by product defects, not user error, but admitting fault too soon makes it harder to file a claim. An experienced product liability attorney can guide you through the claims process and protect your rights.
Questions that are often asked
What does it mean to be UL 2849 certified?
UL 2849 is a full safety standard that tests the whole electrical system of an e-bike, including the battery, charger, motor controller, and wiring, as a single unit to make sure that all the parts work safely together.
Does the law apply to e-bikes that I already own?
No. The deadline of January 1, 2026, is for sales, not possession. You can still own and ride bikes you buy before 2026.
What if I bought my battery online from sellers in other states?
California’s consumer protection laws apply to products sold to California residents, even if the seller is out of state. If the battery causes injury, you may still have legal claims against the seller or manufacturer.
Can landlords say no to e-bikes that aren’t certified?
Senate Bill 712 says that landlords can’t stop people from owning things, but they can stop people from charging devices that aren’t certified inside their units and make them use secure storage areas if they are offered for free.
If a fire in an apartment spreads to other units, who pays?
The cause determines who is responsible. If the fire was caused by a faulty product, the people who made and sold it may be to blame. The tenant may be responsible if they broke the rules about charging. More than one person can be responsible.
Does insurance cover fires caused by lithium-ion batteries?
Policies have different levels of coverage. Some homeowners and renters insurance policies don’t cover battery fires or have limits on how much they will pay. Read the policy terms carefully and think about getting extra coverage for bikes that are worth a lot of money.
Understanding Your Legal Options After an E-Bike Battery Fire
E-bikes are still good ways for people in California to get around. However, battery safety has gone from being a choice for consumers to a legal requirement. The 2026 UL 2849 rule makes manufacturers, importers, and sellers responsible for the safety of the products they sell. This makes it clear who is responsible when unsafe products hurt people.
Knowing these new rules can help keep people safe and protect your rights when fires happen. If you or someone you know was hurt in a fire caused by an e-bike battery, the details of the incident, such as whether the battery met California’s certification requirements, may be very important to your case. A trusted product injury lawyer from Big Ben Lawyers can help you understand how California’s new safety laws affect your case and pursue the compensation you deserve.