Recent cell phones, with their video-capture, flash photography, music and broadcast playback, and long talk-times have complex power requirements, and battery-design is not the only approach to improving performance. I was struck by how there are different voltages used by the different components, from 1.2V for the ultra-efficient processors to 2kV if the phone includes a xenon strobe:
http://www.eetimes.com/article/showArti ... d=51200494
I think a good exercise for my students would be to generate various voltages from one AAA battery, then compare designs for how long they can have the battery last.
Energy use in cell phones more complex at closer look
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