the battery in our engine bays is actually a pretty decent heat shield for SRIs come to think of it...
You know, I'm kinda thinking the same thing. The battery is right between the filter on the SRI and the manifold.
As for it blocking airflow, I doubt it highly. The majority of the air that the SRI is sucking up is either coming up the tube from the factory resonator or in from the nose. Forward motion of the car and the movement of the air isn't going to let much hot air from around the engine and exhaust get up to that filter, in my opinion.