I have 5 dogs all on the underground Francisco AM so batteries can get very expensive on a monthly basis! I tried these as an alternative and so far so good! They seem to have a compare obal battery life and they certainly do keep the collars working and no more worrying about batteries having a beat ordered all the time period the value of these I can order ahead and always have them on hand and be ready and prepared! I have used multiple packages of these at this point. I have never pulled a dead one. I have never noticed a shorter life. The number of times tour pet tests the boundaries will greatly affect this. One was left in the collar and a few unused in a drawer for 2 years after our last dog passed before had need for them again and they worked fine. Used in the Petsafe wireless fence collar.