VIDEO: An ordinance passed by the Milwaukee Common Council last year mandates smoke detectors with non-renewable 10-year lithium batteries be installed in Milwaukee homes -- and officials with the Milwaukee Fire Department are working to spread the word about the new requirement. "We had nine fire deaths this year. Six of those fire deaths were in homes with no working smoke alarm," said Lt. Michael Ball with the Milwaukee Fire Department. The new mandate is an effort to prevent these tragedies. "As of Oct. 1, 2017, the city came up with an ordinance that requires all homeowners to have a 10-year or more sealed battery smoke alarm, so no longer should we have smoke alarms that have the disposable nine-volt batteries. They are so sensitive, which is good. You want that. It gives your family time to react and get out the house quickly," said Lt. Ball.