Is your smoke alarm still working? A smoke alarm with a dead or missing battery is the same as having no smoke alarm at all.
Push test button and hold for 10-30 seconds. If the alarm does not sound, check the battery. If the battery is good, the alarm may need replacing.
You can schedule reminders in your smart phone calendar to make a sound like a smoke alarm beeping as a reminder to check your smoke alarms. You can also schedule an alarm to alert you to change your battery
Suggested reminders for you to check your smoke alarms: