I’ve been riding e-bikes for about eight years, and I currently keep several in rotation. As both an e-bike rider and a California bicycle accident attorney, I have been following the growing number of lithium-ion battery fires with particular concern.
These batteries have made electric bicycles lighter, more powerful, and more practical. But when a lithium-ion battery is defective, damaged, improperly manufactured, or paired with an incompatible charger, the consequences can be devastating. A battery can overheat, ignite, or explode, causing severe burns, toxic smoke exposure, property damage, and, in the worst cases, death.
San Francisco officials are now considering new restrictions to keep unsafe batteries and battery-powered devices out of the city. The proposed legislation follows more than 120 lithium-ion battery-related incidents reported in San Francisco during 2024 and 2025, including a December fire that displaced 130 residents from a Tenderloin apartment building.
For those of us who ride e-bikes regularly, the issue is not whether lithium-ion batteries are inherently bad. They are used safely every day in e-bikes, e-scooters, phones, laptops, electric vehicles, and countless other products. The real question is what happens when a battery that should have been safe fails, and who is responsible when someone is seriously injured.
San Francisco's Push to Keep Unsafe Lithium-Ion Batteries Off the Market
The proposed San Francisco ordinance would prohibit the sale of uncertified lithium-ion batteries and battery-powered devices. Batteries would need certification from a recognized testing laboratory demonstrating compliance with established safety standards, and violations could result in penalties of up to $1,000.
The legislation was prompted in part by the December 2025 fire at 50 Golden Gate Avenue. According to the San Francisco Standard, a lithium-ion battery malfunctioned while a resident was sleeping, starting a multi-alarm fire that caused an estimated $3 million in damage and forced the evacuation of a 77-unit building.
Unfortunately, that fire was not an isolated event. The San Francisco Fire Department reported more than 120 incidents involving lithium-ion batteries during 2024 and 2025. In another recent San Francisco incident, a resident was injured in a lithium-ion battery fire at a Sixth Street hotel. A San Jose resident also died while trying to fight a fire that reportedly involved a sparking lithium-ion battery.
These incidents illustrate why e-bike battery fire safety has become a growing concern in California and across the country.
Why E-Bike Battery Fires Can Be So Dangerous
A lithium-ion battery stores a tremendous amount of energy in a relatively small space. If something goes wrong inside the battery, it can enter a process known as thermal runaway, in which rising temperatures trigger a self-sustaining chemical reaction.
The result can be a rapidly spreading fire, explosive flare-ups, and toxic smoke. San Francisco Fire Chief Dean Crispen has warned that uncertified batteries can ignite without warning, burn at extremely high temperatures, and be particularly difficult for firefighters to control in densely populated buildings.
An e-bike battery fire can be especially dangerous because many people charge their bicycles indoors, sometimes overnight and near exits, hallways, bedrooms, or other living spaces. When a fire starts suddenly, occupants may have only moments to escape.
Potential causes of an e-bike battery explosion or fire may include manufacturing defects, defective battery cells, poor-quality components, inadequate safety systems, physical damage, improper repairs, incompatible chargers, and batteries that fail to meet recognized safety standards.
Determining exactly why a battery caught fire often requires a detailed investigation. That can be critical for someone who has suffered serious burns or other injuries because the cause of the failure may help identify which companies or individuals can be held responsible.
Who Can Be Held Responsible for an E-Bike Battery Fire?
When an exploding or burning e-bike battery seriously injures someone, there may be several potentially responsible parties. Depending on how the fire occurred, an investigation may examine the battery cell manufacturer, the battery pack assembler, the e-bike manufacturer, an importer or distributor, the retailer that sold the product, a repair shop, or the charger or replacement component manufacturer.
One of the challenges in defective e-bike battery cases is that the supply chain can be complicated. The name printed on the outside of an e-bike or battery may not identify the company that actually manufactured the cells or assembled the battery pack. Components may pass through several manufacturers, importers, distributors, and sellers before reaching a consumer.
From an attorney's perspective, that is one reason preserving evidence after an e-bike battery fire is so important. The damaged battery, charger, bicycle, packaging, receipts, instruction manuals, photographs, videos, and purchase records may all help investigators determine what failed and why.
Even badly burned components can contain valuable evidence. If possible, they should not be discarded, altered, repaired, or returned to a manufacturer before an experienced California e-bike battery injury attorney has had an opportunity to determine whether they should be preserved for inspection.
California Product Liability Claims After an E-Bike Battery Injury
California product liability law may allow someone injured by a defective battery or e-bike to pursue compensation from companies involved in designing, manufacturing, distributing, or selling the product.
The facts of every case are different, but a claim may involve allegations of a manufacturing defect, defective design, inadequate warnings or instructions, negligence, or other forms of liability.
Someone who suffers serious burn injuries from an e-bike battery fire may face emergency treatment, hospitalization, skin grafts, reconstructive surgery, rehabilitation, permanent scarring, nerve damage, respiratory injuries from toxic smoke, lost income, and significant emotional trauma.
A fire can also affect people who never owned or used the battery. Neighbors, apartment residents, hotel guests, firefighters, pedestrians, and others can be injured when a defective lithium-ion battery ignites.
When a battery fire causes a death, surviving family members may also have grounds to investigate a California wrongful death claim involving a defective lithium-ion battery.
Safety Certification Can Reduce Risk, But It Can’t Prevent Every Battery Fire
No safety standard can guarantee that a battery will never fail. However, independent testing and certification can help identify whether a battery, charger, or electrical system meets recognized safety requirements.
That’s the thinking behind San Francisco's proposed legislation: stop uncertified and potentially dangerous batteries from being sold before they enter homes, apartment buildings, garages, and businesses.
As an e-bike rider myself, I believe it’s important to distinguish between responsible e-bike use and genuinely unsafe products. E-bikes offer tremendous benefits, and millions of people use lithium-ion batteries without incident. Riders should not have to assume that a properly used battery may suddenly catch fire due to a hidden defect or a dangerously substandard component.
Manufacturers and sellers have a responsibility to put reasonably safe products into the marketplace and provide adequate warnings about known dangers. When they fail to do that, the consequences can extend far beyond the person who purchased the battery.
San Francisco's proposed restrictions may help reduce the number of unsafe lithium-ion batteries sold in the future. But for people who have already suffered serious burns, smoke inhalation, or the loss of a loved one, the questions are much more immediate: Why did this battery fail? Could the fire have been prevented? And who should be held accountable?
As a San Francisco bicycle accident attorney and longtime e-bike rider, I will continue watching these developments closely. The technology behind electric bicycles will continue to evolve, but safety must keep pace with innovation. No rider, family, or neighbor should have to bear the consequences of a dangerously defective battery alone.
If you or a loved one has been seriously injured in an e-bike battery fire or explosion, you can contact the attorneys at Choulos, Choulos & Wyle to discuss what happened and learn more about your legal options. We represent people injured in defective-product accidents, bicycle accidents, and other serious injuries throughout San Francisco and California.
This article is for general informational purposes and does not constitute legal advice. Every case depends on its own facts; please consult a licensed attorney about your specific situation.
