Can i add a second "normal" car battery in the back with/and my audio System ??

I seen people with lowriders have this "special" types of extra batterys in the trunk, and i have seen people use things like the BATCAP 400 in the back . But is it possible to use a normal battery that u find in Sears for ur Amplifier and Subwoofers ??... i know u can run the amp cable to ur battery in... show more I seen people with lowriders have this "special" types of extra batterys in the trunk, and i have seen people use things like the BATCAP 400 in the back . But is it possible to use a normal battery that u find in Sears for ur Amplifier and Subwoofers ??... i know u can run the amp cable to ur battery in the trunk , but i don't want to drain my battery. So i was just wondering could i just buy a second normal battery n place it in the back. WIll it work ?
6 answers 6