The Lithium/Sulfur Dioxide (Li/SO2) military batteries as represented by the BA5xxx/U series have evolved over the past years to a stable design which provides reliable and safe performance. Within the military usage of other countries, batteries which nominally correspond to a given BA5xxx/U have sufficiently different specifications to require design changes. There are special applications for both military and nonmilitary Li/SO2 batteries where the standard design is not suitable. These usually arise because of the need to meet more severe physical conditions. Illustrations of different applications are described. Examples of design changes are considered together with the effects on battery performance.Some of these changes are not trivial and require substantial modifications at the cell level.