Battery acid (usually muriatic or hydrochloric acids) is a strong caustic (PH 0-1) which will permanently etch concrete and other materials. The depth of a hole eaten into concrete by acid depends on the duration of contact. If you spill battery acid from a lead-acid car battery on your concrete floor, there are a number of steps you can take to neutralize the acid and minimize the damage.
Mix three parts baking soda with one part water in a bucket to make a paste.
Pour the paste onto the battery acid until the acid no longer bubbles.
Wipe up the paste using a disposable cloth.