Optima Batteries now offers the Model D27F. The same robust Spiralcell technology used in U.S. Military GSE, is now available in a larger size. 830 CCA for starting stubborn diesel engines. Deep cycle capability to withstand frequent start/stop operations. Safe for air transport. No corrosion or leaking acid. Available commercially or to the military with NSN:6140-01-600-5785. Let us show you how Optima can reduce your overall battery expenses and improve equipment up-time.