Smoke detectors are worthless if they don’t work. Use the return of Daylight Savings Time as a reminder to put fresh batteries in your smoke and carbon monoxide detectors. Some detectors are powered exclusively by batteries. Others are hardwired into a home’s electrical system and use batteries as their back up power. A third type is powered by a 10-year lithium battery which must be thrown away with the unit after 10 years. Take a look around your home to identify the type(s) of detectors you have. Spend a few dollars on batteries and a few minutes installing them and you’ll be ready to spring forward before you go to bed on Saturday March 7. Daylight Savings Time begins March 8.