Huh… apparently I was wrong. The PolaPulse batteries were developed to power the SX70 cameras (which were powered by these batteries in the film packs), and even there, were more than what a typical film pack needed. They’re a sort of flat, flexible LeClanche zinc chloride cell.
So they’re probably just total overkill for a little tiny LED light, which probably needs tiny voltage and current to actually work. I doubt the battery would work for powering a Polaroid SX70 camera by this point though.