The city's population, as of the 2010 census, was 8,57. The average family size was 2.47 and the median age was 60.3. In the city, there were 299 households and 506 housing units. The density was 654 per square mile. The majority of residents were white, with 51.5% being married and 27.6% being non-family. Senior citizens, on the other hand, made up 13.2% of households.
The median age in Battle Lake City was 49.5 years, with 23% of the population under the age of 18. The next largest group was the 25 to 44-year-old group, followed by the 25-64-year-olds. The remaining 33% were 65 and older. The city has a male to female ratio of 45:55.