I am guessing it's a miniaturised charge pump boost (uses a few capacitors and an electronic switch) converter, similar to ones produced by Maxim. http://www.ma

I am guessing it's a miniaturised charge pump boost (uses a few capacitors and an electronic switch) converter, similar to ones produced by Maxim. http://www.maximintegrated.com/en/app-notes/index.mvp/id/725 http://www.maximintegrated.com/en/app-notes/index.mvp/id/725 Nowhere in the article I see an alkaline battery discharge curve. http://www.powerstream.com/AA-tests.htm http://www.powerstream.com/AA-tests.htm Battery discharge curves are never linear. Most capacity is lost between 1.5V and 1.3V. I am afraid this device might be snake oil.