This paper will focus on understanding the value proposition associated with utilizing advanced lithium-ion 6T solutions versus legacy Pb-acid 6Ts for military ground vehicles. The value proposition will include an analysis of the benefits associated with lithium-ion 6T batteries and reduction in life cycle cost (LCC). The analysis of benefits will include comparative discharge curves at various rates and temperatures, discuss enhancements features such as an integrated battery management system that provides real-time battery diagnostics via CANBus J1939 protocol, increased power/energy density, reduced charge time and increased cycle life. The LCC analysis will investigate acquisition cost comparison, replacement rates, and reduced installation & transportation costs. The LCC analysis concludes with a detailed review of how the lithium-ion 6T solution can drastically reduce the operation and maintenance (O&M) cost of the Joint Light Tactical Vehicle (JLTV) over its 20 year life.