They’re exploding in popularity, but doctors say a surge in e-bikes and scooters has led to a surge in the emergency room.

A 76-year-old grandmother was killed when an e-bike battery exploded like a “blowtorch” inside a Queens pizzeria on the Fourth of July – trapping her as she tried to leave the bathroom, the FDNY said.

Editor’s note: The video above was originally published in June 2019, when bike share companies were told to reduce their fleets. Video of a Lime electric bike spewing flames on the University of ...