POWEROWL High Capacity 9V Batteries 8 Pack, Alkaline 9 Volt Battery 6LR61 for Smoke Detector Fire Alarm and More Devices

Customers find these 9V batteries to be of good quality and value for money, with one customer noting they get an 8-pack for the price of two name-brand batteries. They are particularly suitable for smoke detectors, with one mentioning they work well in hard-to-reach locations. The battery life receives mixed feedback - while some say they last a long time, others report they only last a couple of months. The fit is generally good for smoke detectors, though one customer notes they are slightly larger than standard size.