When it comes to finding a good battery for car sound, there are several factors to consider. If you’re looking for maximum power output and reliability, then deep cycle batteries are the way to go. Deep cycle batteries provide reliable performance with high continuous power draw as well as superior resistance against vibration and shock. Additionally, they are designed with thicker plates that allow them to have more energy storage capacity than other types of batteries which makes them perfect for powering car audio systems. Another type of battery worth considering is an AGM (Absorbed Glass Mat) battery, which also offers great performance when it comes to providing long-lasting power without sacrificing much in terms of weight or size. AGM batteries offer even better vibration resistance than their deep cycle counterparts and can be used for both starting and cycling applications such as powering car stereos.