I know I've found a great thread on this before but I cannot for the life of me find it now.

My hiking partner and I plan on carrying one charger each. We will each have a iPhone for guide book, blogging, weather and occasional photos for quick sending to family and blog post and will be sharing a GoPro for the majority of photo/video.

We will both be carrying a wall wort capable of charging two devices at once while in town so in theory we will be able to leave town with all devices at full charge.

At the moment I use a small mophie that can give me about 1 & 1/2 charges. I'm typically pretty good at charging the phone befor it hits 20%, I've read it requires a lot more juice to charge from below that point I'm looking for something that is fairly light weight that can juice up around 3x.

I hope thats enough info. If anyone has saved the link for the last thread on this (it may have been about 6 months ago) please share.

Cheers