If you have a sound system that is overpowering your aftermarket battery, or if you’re planning on using your system for long periods of time while you don’t have your car running, you’re going to need to install a second battery.

Battery Isolator

  • Secondary batteries are usually installed in the back of your vehicle. 

  • You’re going to need to install a battery isolator with your second battery. 


Having a battery isolator installed ensures that the starting battery has enough power to start the engine if the secondary battery is drained. To accomplish this, a battery isolator divides Direct Current (DC) into multiple branches and only allows current to travel in one direction in each branch. This allows for multiple batteries to be charged from a single power source (the alternator in your car) without connecting the battery terminals together in parallel. This prevents situations where a weak or dead battery will drain the charge from a strong battery when they are connected.