FDNY officials told Eyewitness News they believe the fire was started by a lithium-ion battery.
There were several charred e-bikes outside the multi-family home on Devoe Terrace.
Community members, advocates and leaders stood at the intersection of 180th Street and Linden Boulevard in St. Albans with a clear message: "we say no."
The flames broke out inside the building on Church Avenue at East 31st Street in Flatbush just before 7 a.m. on Wednesday.
County Executive Bruce Blakeman and fire marshals say Lithium-Ion battery storage warehouses are a dangerous fire hazard that can start large fires that cannot be put out by traditional firefighting, essentially forcing firefighters to let them burn out.