ULTRALi FE Lithium 9V batteries are great for smoke alarms, carbon monoxide detectors, wireless security devices and more;Great for smoke alarms, carbon monoxide detectors, wireless security devices and more;Lasts up to 5 times longer than ordinary alkaline 9V batteries;Recycle with us! Bring your old dead batteries to your local Batteries Plus location for proper disposal. Fees may apply.