Little round red thing fell out...

[DesmondTheMoonbear]

From the inside of the device above the battery. What is it and do i need to glue it back in?

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[Talyon]

Not sure about glue, but I would put it back in for sure.

 

[edking66]

It is an insulator to keep flat top batteries from possibly shorting out. A little glue won't hurt, just don't get any an the gold colored post in the center.