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Fires from exploding e-bike batteries multiply in NYC, sometimes fatally

New York City is on track this year to record twice as many fires caused by e-bike and e-scooter batteries as last year, and four times as many as the year before.
New York City is on track to experience twice as many e-bike-related fires this year compared to last. Above, the remains of a fire in January in a Bronx apartment.

NEW YORK — Four times a week on average, an e-bike or e-scooter battery catches fire in New York City.

Sometimes, it does so on the street, but more often, it happens when the owner is recharging the lithium ion battery. A mismatched charger won't always turn off automatically when the battery's fully charged, and keeps heating up. Or, the highly flammable electrolyte inside the battery's cells leaks out of its casing and ignites, setting off a chain reaction.

"These bikes when they fail, they fail like a blowtorch," said Dan Flynn, the

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