Battery lifetime is one of the critical design parameters for mobile computing d evices. Maximizing the battery lifetime is a particularly difficult problem due to the nonlinearity of the battery discharge behavior and its dependence on the discharge profile. In this paper, the problem of task scheduling with dynamic voltage scaling such that the maximum consume battery capacity is addressed. T o deal with the shortcoming of the existing battery-aware DVS policy, the idle time distribution adjustment procedure is proposed, which optimizes id le time dis tribution and then reduce the battery capacity consumption, and the cha nge of task scheduling under the procedure is analyzed. The experiment results s how that the proposed procedure can save more battery capacity consumption evidently than th e existing battery-aware DVS policy.