Car audio systems use the most reliable type of rechargeable battery the 12V 35AH - Nut Bolt valve regulated lead acid battery. Chrome Battery offers a large inventory of Block Shakers High Performance Power Cells to replace your existing battery. Each Block Shakers 12V 35AH Car Audio Battery is maintenance free and fully charged. Block Shakers is constructed with lead calcium alloy and absorbed glass mat technology which allows a completely maintenance-free operation. Block Shakers are sealed lead acid no spills or leaks and will provide extreme vibration resistance for all that pumping bassFeatures. No Spills No Leaks No water to check. AGM Separators for superior design. Heavy Duty Terminals. Extreme Vibration Resistance. Improved Life Cycle Performance. Supplied Factory Activated Filled Sealed Charged for immediate Use. Dimension - 5.12 x 5.12 x 6.26 in.. Item Weight - 26.05 lbs.