Enegitech CR123A 3V Lithium Battery, 123 3 Volt Lithium Battery, for Home Security Alarm System Sensor Doorlock Smok Carbon Monoxide Alarm Non-Rechargeable (CR123A 2 Pack)

Customers find these batteries to be of good quality, working well in various devices including Vivint glass break detectors, and appreciate their value for money as a cost-effective backup option. They fit well and are just what customers need. The battery life receives mixed feedback - while some customers report long-lasting capacity, others mention they don't last more than 24 hours.