Its probably the battery moving around in its compartment. I noticed this too at first which freaked me out. Sounds just like a small piece of plastic. But after situating the wires in the battery compartment in a better fashion which put pressure on the top of the battery the rattle stopped.
If you do this be careful of the wires they are very thin. I would suggest just taking a very small piece of cardboard and folding it and sticking it at the bottom of the battery between the battery and compartment which should have the same effect as what I did.
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