Stinger SPV44 660-Amp Power Series Dry Cell Battery with Protective Steel Case for Systems Up to 1320-Watt 12V Power Series Dry Cell Battery Sealed absorbed glass mat (AGM) design Can be used as a replacement for your vehicles standard battery Can also be used as an additional battery to power your high-performance sound system Leak-Proof, non-hazardous design / 100% Sealed and maintenance free 5 second cranking output of 300 amps Nominal capacity of 20 Ah Internal resistance: 0.0011 ohms Optional protective steel case This item is not for sale in Catalina Island