Looking for information on these items. More and more, I am using my cell phone/camera when out in the field, as well as lights (headlamps, flashlights, lanterns). More and more I am using rechargeable batteries, and power banks look like a fairly versatile item to keep everything topped off.

Ideally, I would carry something light enough to be feasible for backpacking, but also able to top off the phone or light a few times - probably somewhere around 10,00mAh capacity.

The problem is I know squat about these gadgets, so looking for guidance and advice.

Power bank gurus, please chime in...