The landlord is responsible.
Battery operated smoke detectors may be installed within the tenant space in most multiple dwellings provided they are maintained, tested and inspected as follows:
- The owner of the building or his representative shall inspect each detector whenever a change of occupant occurs; and
- The owner of the building or his representative shall clean the detector and/or replace the batteries as necessary, but at least once a year, to assure proper operation.
- It is generally accepted that the owner will supply batteries as needed to the tenants.
As a tenant, you should test the smoke detectors regularly and report any malfunctions to the owner.