Minyong Kim, Young Geun Kim, Cheol Hong Kim, and Sung Woo Chung, "Measuring Variance between Smartphone Energy Consumption and Battery Life", IEEE Computer Magazine, vol. 47, no. 7, pp. 59-65, July 2014.
A case study reveals that energy savings do not always translate to
longer smartphone battery life and that evaluating any savings plan must
be based on battery consumption, not energy used.