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the weight might start getting bit of a problem here too? Hiding the battery somewhere behind ear could help, but ruins the conceptual elegance

Probably not worth the effort. Some women wear pretty large earrings[0] without too much trouble, after all.

The patient in question wore heavy earrings for years. Wearing moderately-heavy LED earrings every once in a blue moon isn't comparable to that.

Usually they are large but surprisingly light, made from very thin metal foil.

Hairclip the battery with tiny wires behind the ear. You could put the controller there too if you wanted something fancier