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/10.114

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/pdf https://iopscience.iop.org/article/10.1149/1945-7111/abcf50/...