Real Estate New York group
The law says that starting April 1, 2019 all new or replacement smoke detectors in New York State must be powered by a 10-year, sealed, non-removable battery or hardwired to the home. Homeowners and landlords must upgrade their smoke detectors before selling or renting homes and apartments in New York State.
The upgraded smoke detector alarms include a sealed lithium battery with a 10-year lifespan. The Clifton Park Fire Department says that while these 10-year smoke detectors have a larger upfront cost than traditional alarms powered by replaceable batteries, the lack of yearly battery changes makes them cheaper over the life of the device.