The FDNY says the number of fires started by lithium ion batteries has increased exponentially in the last few years, as have the number of people killed by those fires. They can be deadly when they’re charged improperly.

Some elected officials say a disproportionate number of proposed storage facilities for lithium ion batteries are sited in Staten Island. Staten Island Borough President Vito Fossella talked with WNYC's Sean Carlson about his concerns.