From fuel-cell cars to MP3 players, energy conservation is growing more important for many machines that we use every day.Exceptional power management is especially important in portable electronic devices such as cell phones and digital cameras. No one wants their phone to run out of power during an important call, or to haul packs of extra camera batteries around on a vacation trip. As electronic devices become more sophisticated and feature-rich, their applications demand more power and their hardware takes up more space. At the same time, consumers are demanding smaller, sleeker and cooler designs.