Just changed the battery on my Applause Ovation tenor and I must say it takes alot of patience. I cursed the people who designed it in every language I knew. The battery change was easy. Just the putting the battery case back was the hardest. You can't line up the case with the locking screw visually. It's all by feel.I don't know why they didn't make it more user friendly. I still love it though, but I'm dreading the next time to change the battery. Hopefully they come out with one that's easier.