Publisher Summary This chapter discusses applications of some of the main types of lithium batteries. Lithium-sulphur dioxide batteries have their application in the military field and in the operation of electronic components, especially where high energy density, long shelf life and low weight are requirements. Applications for lithium-thionyl chloride cells and active batteries include all those for which active lithium-sulphur dioxide cells and batteries are recommended and also high-temperature applications. Other applications of lithium-thionyl chloride cells include utility metering gauges, security alarm systems, automobile electronic systems and well logging, and electronic applications. Lithium-vanadium pentoxide have two main applications: reserve batteries are for applications requiring extremely long shelf and operational life (10-30 years) and relatively low discharge rates. The lithium-copper oxide battery has applications in power well lagging equipment, microprocessors, public address systems, high-temperature heat counters, and specialized industrial and military applications..