Pay no attention to that other definition. The REAL battery acid is a mixture of a sparks energy/alcohol drink with 2-4 shots of your favorite vodka, preferrably a citrus, making one hip drink. The term "battery" comes from the striking similarity the can has to an energizer battery. Just hook it up and get ready to party.
Partygoer #1: Check out Teo on the dance floor. How's he able to blow up so huge?!
Partygoer #2: Must've had some battery acid.