just a few quick notes on the iphone 6, which I had a chance to use it on my recent Bob Marshall Open trip
I started w/ 100% battery life at the start and 77 hours later I had 56% battery life-not too shabby, the phone was in airplane mode and GPS was switched off in Gaia (a setting in the Gaia software), when ever I needed to know my location (frequently in the Bob in May!) I would just hit the "show me where the he11 I'm at button and the gps would be activated for short period, if I wanted to start a track it would stay on until I ended the track (I never used the track feature for fear of running out of juice) . I took a ton of photos, looked at the loaded map a bunch and when needed hit the gps location button. It was on ~ 18 hours a day and then shut off at night
I kept it in a Lifeproof case, the lightest, thinnest, waterproof case I could find- the phone was kept in a cargo pocket for quick access for photos, I lost track of how many fords where my pants were wetted up to my thighs (and the phone submerged) and had no moisture issues
anywho, a nice piece of multi-use kit that should last w/o a charge close to a week
