Here is what happens when some brain gas escapes and a question gets asked of the old Puckered Petes. When I was a kid hanging out at the local drug store there were plenty of magazines on the rack to read. I picked up an 'Argosy' and noticed in back that an advertisement for a meraculous battery additive called vx6 was available. I knew nothing about the squadron in 1957 but it was said to renew batteries and had been tested in the coldest extremes.
Car pull in, wash the windows, check the oil etc.etc.
I think I still have some in the basement, someplace, it should probably be removed by the E.P.A. I had forgotten about it till I saw your e-mail. I had a battery that would no longer hold a charge. My uncle gave me some VX6 and then put it on the charger over night. I got 2 more years use from that battery. There is an auto store in my town that still has some available.