Powermax 12-Count 9V Batteries, Ultra Long Lasting Alkaline Battery for Home and Office, 7-Year Shelf Life, Reclosable Packaging

Customers find these 9V batteries to be of good quality and reliable, particularly noting their effectiveness in smoke detectors. The battery life receives mixed feedback - while some say they last a good while, others report they don't last as long as expected. Power delivery is also mixed, with one customer noting inconsistent performance. While some customers say they will buy again, others express dissatisfaction with the product.