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Our 12-Volt SPP Series Dry Cell Batteries features a sealed powerful absorbed glass mat (AGM) Technology, leak-proof design and is perfect for high wattage car audio sound systems. They can be used as a replacement for your vehicles battery or as an additional battery to provide the extra power needed for a high performance aftermarket system. Removable brass battery posts allow these power cells to fit in most factory battery locations with no hazardous leaks.