I got a few Hexbrights from the Kickstarter project, and I love it. It does cost eleven times as much as the mini-torch, but it's very flexible, and immensely powerful! I keep mine in a mesh pocket on my backpack, and its highest setting is bright enough to serve as a bike headlight.

My Hexbright:

I use the Anker Astro E4 external battery for my devices when i travel. This mighty 13000mAh battery has a build-in flashlight. I suspect it will come quite handy when my Ingress adventures pick up.