Best way to charge iPhone while camping in tent?

I'm going camping in a tent for 6 nights in July to the west coast of Scotland and was wondering what the best way to keep my iPhone 4S charged up would be? I won't have a car with me.

I don't know if this is true but I heard if you put it on airplane mode, it will charge the battery

I would put it on a battery save mode, and buy another battery before you go and charge them both up so you can swap when one runs out.

Well you can't charge it then can you? Charge it up before you go and don't turn it on except if you need to use it for emergencies, just tell friends that you will turn it on for an hour each day say from 6pm-7pm if they need to contact you that way it will last the week out.

Solar Power,
http://www.rei.com/product/827121/goal-zero-guide-10-plus-adventure-kit-solar-charger

What is an iPhone?

Scotland has no solar energy. Use the cloud.

External battery pack.

Charge it up before you go

It's camping, you don't need a phone.
You can buy hand-cranked radio from
http://www.ccrane.com/ or
a lantern
http://www.goalzero.com/shop/p/112/Lighthouse-Lantern/10:1/
both of which can charge a phone via USB port.

But isn't the whole point of camping to get away from high tech?
But that's like just my opinion, Man.
http://www.youtube.com/...y9itk&NR=1

If you want to you can turn off the phone overnight and then it will have twice as many days use in it - so should be long enough to last. I would also be tempted to just use it as you want and not when people want to call you - so keep it off most of the time!

I say this not as a grumpy old man but the weather in Scotland can be wet at for most months and also when youare camping there's often little protection from water - your phone will get wet and there's the possibiility it will get damaged. So kept in the tent when you don't need it and turned off might protect the phone and also keep the battery life long enough to use as you want.

First thing is to reduce the phone's power consumption by turning-off features you don't need. For example, turn-off Wi-Fi and bluetooth, since you won't need them. If you're not relying on the phone for navigation, turn-off the GPS (Location Services).

Schedule your non-emergency cell phone use so you can turn off the phone entirely for most of the day, only turning it on at pre-determined times so you can talk/text/tweet to friends/family to update them on your status.

For recharging on the trail I use a GoalZero battery pack with Energizer lithium AA batteries to recharge my iPhone 4S. Lithium batteries provide more power, work better in cold weather and are lighter than standard alkaline batteries. I can put 4X AA batteries in my GoalZero pack, plug-in my iPhone and go from 10% to over 90% in an hour, and still have enough juice left in the GoalZero pack to top-off the next morning.

I tried using the GoalZero folding solar panel with the battery pack, but found it too bulky, awkward and unreliable to carry and use while on the move, particularly on less than bright, sunny days.