Trying to get some assistance in the installation of a BMW Motorrad Communication System in a new Schuberth C3 helmet.

After find some instructions on the Internet after finding nothing in the BMW package, I've removed the helmet liners but found that the cavity where you're supposed to insert the battery package is a bit too small, causing the helmet's inner shock absorbing material to bulge inward.

Is this normal??

Have to say I'm a bit irritated since the dealer won‘«÷t install this, even though I just dropped over a grand on the comm system and the C3 helmet.
Any assistance is greatly appreciated.