Paper in the battery compartment?

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The paper is used to cushion the batteries from rattling around inside the compartment. I finally figured it out when I got my first cheap vibe from Spencer's. They caused a racket without the paper.

It might be there to take up space so that the battery is more centered.

I would leave it in, the plastic and paper inserts in the battery compartments are there to help the rattling and some to show the user which way to insert the battery.