Heat 230-volt Alarm with 10-year lithium battery back-up - Brooks
Tenergy 9V NiMH Battery, High Capacity 250mAh Rechargeable 9 Volt Batteries for Smoke Detector/Alarms, TENS Unit, Metal Detector, and More (4 Pack) : Amazon.ca: Electronics
Smoke Alarm R240RCB - Red Smoke Alarms
Lithium Battery Smoke Alarms Are Dangerous | Universal Security Instruments
9V Lithium Battery, High Capacity 1300mAh,with 2 in 1 USB-C Charging Cable, Rechargeable 9 Volt Square Batteries for Smoke Detector/Alarms, Microphones, Flashlights, Metal Detector(2 Pack) : Amazon.ca: Tools & Home Improvement