Damage to cars from battery corrosion happens fast and is often devastating. I would recommend not fooling around with present battery or pad.

Using a pad assumes you have a leak which will not be solved by the pad. Once the alkalinity of the pad is neutralized, the problem will continue.

I suggest rather a good gel cell battery that is completely sealed and cannot leak - like the Optima battery. Yes, expensive but compared to a perforation of the chassis rail beneath the battery from corrosion...?

P.S. The battery acid neutralizer you bought is water and baking soda mixed. Far cheaper to make your own. It's a good tactic to clean up with it, and then wash with fresh water making sure that all traces of both battery acid AND neutralizer solution are gone.