Two people who were critically hurt in a fire in Washington Heights on Sunday have died — and a lithium-ion battery sparked the blaze, fire officials said Tuesday.

The fire broke out on the fourth floor of a five-story apartment building on West 190th Street Sunday afternoon, the FDNY said.

Two other people who were hurt in the blaze remained in critical condition as of Tuesday afternoon, FDNY Commissioner Laura Kavanagh said at a news briefing.

The FDNY didn’t immediately release the victims’ names or ages.

Fire marshals determined that a lithium-ion battery caused the fire, Kavanagh said. Investigators found several additional lithium-ion batteries inside the apartment, she said.

Lithium-ion batteries have sparked 76 fires so far this year, killing seven people and injuring 60 others, the commissioner said.

The FDNY released a new public service announcement Tuesday focused on the safety precautions New Yorkers who use electric bicycles need to take, as the devices are powered by lithium-ion batteries.  

“We want to continue reminding New Yorkers of the safety messaging around these devices, and awareness surrounding the best practices for having these devices in your home,” Kavanagh said.

“We know that micromobility devices are already here. They are in your home today. But we really need the public to heed our warnings and please use these devices safety,” she added.