Battery certification: UL 2271 vs UL 2849
UL 2271 certifies the battery pack itself — cells, BMS, enclosure, thermal performance. UL 2849 certifies the whole electrical system — battery, motor, controller, charger together. Most brands certify to 2271 only, then market as 'UL certified.' That's not the same as 2849.
After the NYC e-bike fire fatalities in 2023, New York City requires UL 2849 for any e-bike sold or rented in the five boroughs. Many other municipalities are following. If your bike isn't UL 2849, you may have insurance, building, and resale problems coming.
The 3-class system — and where states diverge
The model legislation (adopted in 30+ states) defines: Class 1 = pedal-assist to 20 mph, Class 2 = throttle to 20 mph, Class 3 = pedal-assist to 28 mph. But state and local rules diverge constantly: trail access, age minimums, helmet rules, registration, and where Class 3 is allowed all vary.
Our Laws by ZIP page is the only one in the industry maintained by people who've sat in state-house hearings on this. Most affiliate sites just copy the federal definition and stop.
CPSC and recalls — the list you don't see
The Consumer Product Safety Commission has issued dozens of e-bike battery recalls in the last 5 years. Most never make a press cycle. We track them and add them to relevant review pages.
When a brand recalls a battery, the right move is: stop riding, stop charging indoors, file the claim immediately. Most riders find out months later, after the recall window closes.
"If your bike is UL 2271 only, your insurance company can — and increasingly will — deny a fire claim. That's not theoretical. We're seeing it in 2026."