Batteries that Satisfy Customers, DIAMOND produces high-performance, high-quality batteries through continuous R&D and rigorous quality inspections to provide the best batteries to customers.Customer satisfaction is the fundamental value at DiamondDiamond BATTERY is Sealed maintenance automotive, THE BEST SELLING BATTERY with the following features    - complete protecting against reduction of sulfuric acid. Preventing electrolyte loses by collecting and returning liquid to reservoir    - Consistent starting performance high durability achieved by adoption of special wrought lead calcium grids and low resistance envelope separator    - Longer lifetime achieved by minimizing vibration which reduces battery lifetime