Mighty Max Battery Viper VP-600 600 Watt Car Audio Battery for Phoenix Gold 400.2 Brand Product Reinforcement For Amplifiers or As Your Starting Battery Where Weight Is A Concern Viper VP-600 12V 18Ah 600 Watt AGM Car Audio Battery Sealed Non-Spillable Design Can Be Mounted In Any Position Without The Worry of Leaks and Spills Withstand Higher Temperature and Vibrations Than The Leading Brand Name Batteries. AGM Technology For Better Power Efficiency, Longer Life and Maximum Sound Performance!