Have you changed the batteries in your smoke detector recently? The Ossining and Briarcliff Fire Departments remind us that the time change is an excellent time to change the batteries in your smoke detector. If you did not yet do that, we are still within your month window! Batteries should always be changed every six months and the smoke detector itself should be replaced every 10 years. Do not wait for an emergency to find out if your smoke alarms are working.