Sooner or later all your music boxes with the ability to save settings, patterns, projects etc. will need to have the battery replaced.

When you switch the power off, the battery basically runs the thing so it can keep your saved stuff. :slight_smile:

Usually it’s no big deal, tho. Just a matter of unscrew, lift of, unplug and exchange.
On some devices it can be a little fiddly, especially when there’s no battery holder.