¡Hola Enjoil - welcome to my garden!
I dilute the battery acid down to 7.5% and use it as a pH down. And actually, it does provide additional sulfur, which is considered essential for increasing flavor. I use this because a) it’s cheap and readily available at any auto parts store, and b) I don’t want to add too much phosphorus to my mix (most pH down is a diluted phosphoric acid).
Edited to add: If you decide to dilute battery acid, REMEMBER - ACID INTO WATER!!
(A before W) - doing the reverse can result in serious injuries.