I purchased these In November, 2017, and installed them in 27 wireless sensors for my home alarm system on New Year's Day 2018.Fast forward to today, in September 2018 - these batteries are still working just fine! The only exception has been a sensor for the front screen door, which is opened and closed many times each day, causing the sensor light to light up each time. I had to replace that one battery today, prompting me to write this review. So far, the life of these batteries in my sensors is 9 months, and based upon their performance so far I would not be surprised if they even get to a year.I have had this alarm system for 3 years, and previously bought the cheaper batteries that are offered on Amazon. Those lasted anywhere from 3 to 6 months at most, depending on the brand.Changing batteries is always a bit of a hassle for everyone, but having to change frequently 27 batteries in my alarm system sensors every few months is over the top. That is what I was doing regularly before I bought these batteries. I definitely recommend these Duracell batteries over any other 23A battieres listed on Amazon.Once you calculate the higher price and low change rate of these batteries vs. the lower price and higher change rate of some of the other batteries here, it is easy to see that these batteries are the best value.