Bests & Worsts Reviews from Amazon

Put these on a 6 month subscribe and save and use them to replace the batteries in your smoke detectors at regular intervals. I got the last batch on November 28 2015 and exactly 2 months later on January 28 2016 the 2am chirps from a smoke detector indicating a low battery went off on one. A day later, a second chirp at 7am on Jan 29 went off. I'm canceling the subscription and going back to a name brand, and replacing the rest of the batteries this weekend.