Haven't gotten around to posting lately, because I've been tied up putting together new projects, editing wedding videos for my brother, and much more. Didn't want to miss the chance to link to some press that's going out on one of the products I've been busy working on. It's fun to make things that save energy. It's even more fun to make stuff that runs on microamps of current, and therefore can operate practically forever with just a small solar cell.
I think some of the other case designs I (and others) came up with would have looked cooler, but I'm glad we went with the one we did, because it's simple, clean, and unobtrusive. It's still battery-free wireless, even though it provides a battery backup option. With a good quality lithium cell in it, the battery would probably last 20 years, though I obviously haven't tested it for that long.