The article reads like a scam for exactly this reason. Sure, if you scale the power you draw from the battery as the voltage drops then I don't doubt you get a 8x increase in battery life.
But if you keep your power draw constant - ie. you're actually powering something useful from your battery - then current draw must rise as the voltage falls, and it will fall asymptotically. I can't see you getting anywhere near 8x; more like 1.5x. If that.
But if you keep your power draw constant - ie. you're actually powering something useful from your battery - then current draw must rise as the voltage falls, and it will fall asymptotically. I can't see you getting anywhere near 8x; more like 1.5x. If that.
Here's a random page with graphs, because science: http://www.powerstream.com/AA-tests.htm