I have successfully changed the battery on my Assisi loop and it works perfectly. If you are good with soldering and circuit boards, it’s not difficult. You have to de-solder the old batteries and solder new ones in. I’m willing to do this for you if you don’t want to mess around with that part. It’s a lot better than spending 300 dollars every time. Let me know if this interests anyone. I love helping people and their animals so get a hold of me