Lipo battery rattling in case

[StuartH]

Hi there, over the weekend racing I noticed one of the stick pack lipos started to rattle.

The case is not cracked, swollen and has not changed size at all but the cells inside it (or something else is moving about)

Now these are simple hobby wing zippo lipos and nothing special but is there a major issue Here or am I just being paranoid?

Me and my son race off road and there a quite a few jumps so I'm guessing it's not going to get any better unless I can open the pack.

Any ideas or suggestions?