The perfect solution to 12v car audio lithium battery wonders is here! This will help out those who both do and dont have a high amperage custom alternator. NOTE that having an upgraded electrical with a high output alternator will benefit the JP 40 - 12v car audio lithium battery but is not needed. This 12v car audio lithium battery is good between 6000w thru 12,000w systems. lithium car audio battery