iPhone 5 has 1,440 mAh battery.
The GPS works while you have no signal or your phone is broken. The GPS on my 4 and 5 have been just as good or better (ie. accuracy & speed of acquisition) than my Rino 530HcX and that is saying a great deal.
I use Gaia GPS and pre-download USGS Topo and aerial photos. The image quality is far superior to my Garmin and the maps are free (once I paid the initial $10 at the time).
I take a New Trent 5,500 or 9,900 mAh external battery depending on the trip.
I usually get 2-3 days of use from my phone with moderate use but turning it on airplane mode when not in use. I will often use it at night to play poker or scout for the following day.
The SPOT Connect allows you to text custom SPOT messages with your smart phone. I just use my regular SPOT for checking in. I would rather have something proven and simple.
I keep the phone in a ziplock bag in my pocket just as a pre-caution.
Over the last two years I have realized that I like taking pictures during the hunt thus having something to look back on (something I never did before). I was lucky enough that my partner took my avatar picture with my iPhone this last year on the top of the mountain about half way to the truck, right at sundown. It was a quick, "Hey take this and take a few pics" moment and I am forever grateful I carry the phone in my hip belt pocket at all times now while hunting.
I have the 'best' / lightest solar setup (Nomad 7 w/ Guide 10 battery pack) and it's pointless for what we do unless you can leave it at spike camp every day. The battery pack will charge your phone once before needing to be recharged in the sun. There is no point to carry something that weighs 22.8 ounces when you can carry an external battery that will fully charge your phone at least 5 times (maybe 6 depending) for 9.23 ounces (without maintenance or BS). I guess unless you plan on staying for weeks on end.
The alarm clock is very nice.
Any other questions?