I'm pretty sure that is a bad idea.
Off the top of my head, I don't recall the reason why. I do remember reading several past
threads of folks using tin foil in the battery compartment of their
mods and they always were always moved (by a forum moderator) to the "Not Recommended" sub-forum. I tried to find this forum to document "why" that is a bad practice, but I can't seem to find it.