As you might understand from my previous post, I’m not really in favour of batteries.. running alkaline’s gets expensive, and with rechargeables you not only have a 20% lower voltage, but also performance varies between batteries. And as a diver I'm also concerned about the environmental waste issue.
I believe this guy has nailed it:https://www.kickstarter.com/projects/sh ... le-battery
It uses the first graphene li-ion supercapacitors. These are 3.8V, and can’t go below 2.2V. He’s packed this in size of AAA (and other sizes), and each one contains a chip to regulate the output to 1.5V, as well as to shut if off when the capacitor itself reaches 2.2V.
A bit expensive for now, but I’d like to be a fly on the wall in the HQ’s of Maxwell, Duracell etc.