Going on 2nd year of using this lock every day, and have only put in new batteries twice, counting the first set! Love the smart key feature that allows it to be keyed to a different key as needed, if needed. Also love the re-lock feature, use this all the time. If I'm in a hurry, I just run out, close the door and it locks itself 30 seconds later! You just can't beat Kwikset for dependability and ease of use.