Brk Model 4919e Why Wont My Fire Alarm Stop Chirping?????

Why wont my fire alarm stop chirping????? - brk model 4919e

It started at 1.30 clock this morning, about every 10 minutes, it beeps. I have replaced the batteries in all these countries, because I did not know what it was. Also cleaned. They are about 7 years, but never out of the kitchen smoke or something for those who do not have to be replaced. But you squeak. They are the BRK Electronics Model # 83r.