Lithium-thionyl chloride (Li-SOCl2) batteries typically have a nominal voltage rating of 3.6 volts. This voltage remains relatively constant throughout most of the battery's discharge cycle. It's important to note that the actual voltage may vary slightly depending on factors such as load, temperature, and the specific design of the battery. Additionally, some Li-SOCl2 batteries are manufactured with higher voltage ratings (e.g., 3.9 volts) to provide increased energy density and performance, but the 3.6-volt rating is a common standard.