Nylon cannot be made into car battery because it is not resistant to the acid in the car battery.
Car battery acid consists of Hydrochloric acid and Sulphuric acid.
Car or automotive battery acid is 30-50% sulfuric acid
A car battery has sulfuric (sulphuric) acid in it.
It's an acid.
acid
The pH of car battery acid is normally around 1 (extremely acidic).
Lead - acid
If your car battery smells like "rotten eggs" then your battery is producing excessive hydrogen and is probably not safe. Please check you cars' charging system and make certain that the battery is not being overcharged. The battery can possibly explode.
It is sulphuric acid.
Sulfuric Acid
It's an acid.