How to make my iphone 4 battery last about 5 days?

I'm going to reading festival an i really need my phone the whole time and iphones literally run out of charge in like a day and a half at most! Is there anything you can buy, maybe like a portable charger thing, that would keep you battery going for about 5/6 days?

Will apple give me a new iphone?

I have an iPhone 5s and the headphone jack has stopped working. I have cleaned it out but still nothing. I looked online and people said take it into apple because I still have warranty on the device but will they give me a new phone or fix it one the spot? If they do give me a new phone, will I be able to pick a different colour?

How to save pictures to iCloud?

I have lots of pictures that I took on my iPhone and then I uploaded them onto my Mac. Once they were uploaded onto my computer, I deleted them off my phone to make space. So if anything were to happen to my computer, all my pictures would be safe up in iCloud, right? How would I save them to the cloud from my computer? Or how do I know if they're already saved there?

How to fix my iPhone 5s touch ID sensor?

I use my iPhone 5s frequently (so much that even with a charging case the charge does not last a full day sometimes) and it seems to me that the touch ID sensor just gets worse and worse. I often need to try agian or even enter the actual password to unlock my iPhone 5s and I'm getting tiered of entering the password. I have only had this issue while unlocking the phone and never purchasing contend off of the app store or iTunes store. I have also found two temporary fixes to the issue but neither last long (restart my phone or redo my fingerprint in the settings). Please tell me if there's a way to fix this. Also, I'm going to the apple store (Spokane, WA) this Monday and can just take it there to get it fixed if that is the best option.

How much should I sell my iPhone 4? - 2

How much should I sell my iPhone 4?

Added (1). I have a Sprint iPhone 4 and I want to sell it. It's white and has no cracks and barely has any scratches, it's looks brand new but it's been used for only a short time. Iwant to sell it on eBay but I don't know how much I should sell it for.

Can I add songs to iPhone via new computer while keeping the songs I already have on my phone?

Ok so my old computer just broke Rendering everything I have on iTunes useless, However I have all the songs I want stored on my phone anyway. Now can I insert my phone into a friends computer and somehow just add songs to my phone without losing the songs I already have stored on my phone, Also all the songs I have on my phone are NOT purchased from the iTunes store…

Hopefully there's a way so please guys let me know!