9V Batteries Carbon 9 Volt Battery for Smoke Detector 9V 6F22 Square Battery, Long-Lasting, 4 Pack

Customers find these 9V batteries to be of good quality and value for money, working well for smoke detectors. The battery life receives mixed feedback - while some say they last a while, others report them dying within 9 months of use. Power performance is also mixed, with some customers satisfied with the power output.