Do you actually check them with a Voltmeter prior to tossing them Away? Have you validated they are going bad monthly? I use them outside in Ohio winters (muti-sensors) and they do report low battery, but they continue to work the entire winter without needing changed. The voltage will drop a bit due to the cold, and cause them to report low battery, but they continue to work well throughout the winter months. I don’t toss them until voltage is under 2. 8v.