In order to remove the battery u have to remove the plastic piece that inserts into the windshield. You notice that the windshield butts up against an originally white foam piece that over time gets dirty and fragile and I guess this is what keeps water from the windshield going own into your open passenger area where the filter sits. Aaron said this white piece needs replacing and his dealer did and that it is recommended each time it's removed.
I had my dealer look up the details and conclude not finding the part number. This is completely my guess but my thinking is this piece is not sold separately and u have to buy the whole plastic piece that goes into the windshield that contains the foam. And if that hypothesis is accurate then it would lead me to think what Aaron is thinking is false. But then how would Aaron get a new piece if that was the case.
I'm not sure. It's bugged me awhile.
Aaron can u chime in?