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Tape it to the side of a couple of D cellsHow are you going to power them?
Mike.
That was sarcasm, hence the smileyD cell battery looks to big. Is there smaller that is rechargeable
OP actually made me curious on his projectI'm dubious you could fit what you want in the size of a five pence piece anyway, never mind a battery as well - a multicoloured LED (like the WS2812) is 5mm square on it's own, and a 5p is only 18mm diameter.
Just make sure that whatever you choose is indeed rechargeable. Most small lithium coin cells are not.I can't say to much but I just want to get info on the smallest controlable led and rechargeable battery available.
It would be similar to modern head phones. Individual chargeable units but with a multi coloured led to illuminate clear plastic.