Can I use a car battery for my audio system?
Unless you want to listen to music with your engine off, adding a dedicated car audio battery isn’t going to do you any good—and it may actually hurt. That might seem counterintuitive, but the reasoning is simple. The battery in your car is there to serve one purpose: to provide enough amperage to start the engine.
How big of a battery do I need car audio?
Will adding a second battery help my audio system?
Having an extra battery will help your system sound better at higher volumes and can dramatically increase the longevity of your amplifiers.