Your local fire department will want to very closely inspect your explosive materials handling and safety procedures. Think about what big banks of lead-acid batteries have to do, and google the pictures of battery rooms with their roof blown to bits.

It doesn't work so easily; if you do that, the battery itself will fall apart because of deposition of the iron. See: https://iopscience.iop.org/article/10.1149/1945-7111/abcf50/...