Using our ECOSystem prototype, we implement several currentcy-based policies, including: currentcy conserving scheduling algorithms that reduce residual battery capacity, proportional energy sharing, self-pacing to smooth response time variation, and energy efficient disk management. Our results show that the currentcy model is a powerful framework for expressing energy management policies and that our currentcy-based policies, by being able to capture aspects of global energy use, provide more coherency to system-wide energy management.