I heard a rattling noise from my Pocket Reform so I opened it to check.
This little piece of the battery holder had broken off.
It doesn’t seem to have any critical function to me. It it ok to just leave it like that?
I’m glad it was just plastic so no risk of shorting anything 
Yeah, they’re a little brittle. Same happened to me and had the same feeling of relief that it wasn’t a screw or something that potentially might cause a short.
I’m going to guess that’s the same part that’s been rattling in mine since arrival. I should probably open it up finally and rescue it. 