Beginning January 1, 2023, any new smoke alarm that is installed within a single or multi-family home is required to be an alarm that features a 10-year sealed battery.
Smoke alarms in single or multi-family homes prior to January 1, 2023, may remain in place until they exceed 10 years from the date of their being manufactured or fails to respond to operability tests or otherwise malfunctions.
For more information, please visit the Illinois Fire Safety Alliance.
Original source can be found here