A:Answer I really can't say, since I just bought it a little more than a month ago. I would say that they last 7 - 10 years. By that time you'll want to have the latest technology anyway. This UPS Backup is so much better that the one I had. It takes up less space standing upwards and it's easy to turn off the sound, if your battery dies on you. I couldn't turn off the sound on my last one when the battery had to be replaced. It drove me crazy and I had to take a Lunch break from my job and go and pick this one up. What an improvement!