Why is my iPhone dying at 100%?

So recently my phone has been dying at 50% until 2 days ago where it can barely go without being constantly charged. I have an iPhone 5s, and it's updated to iOS 8.3. If you have answers it'll really help, this is so inconvenient.

How to delete undeleteable pictures off iPhone 5?

Every time I connect my phone to my compute my phone automatically imports any new pictures to iPhoto.

Now I have no space on my phone because iTunes says I have over 8,000 pictures when I only see about 400 in my photos. When I tried to delete them manually through iPhoto on my phone, the trashcan in the bottom righthand corner turns gray.

I have spent the last 3 hours researching a re-trying the same methods:

I have gone into iTunes and tried to deselect albums but they're already deselected so I can't sync it.

I have synced all the photos from iPhoto (computer) to my phone and tried the previous method above and iTunes says I still have over 8,000 photos.

I have created multiple blank folders and tried to sync it and lo and behold I still have over 8,000 pictures on it.

I'm getting extremely frustrated and I have no idea what to do. I don't want to call Apple because they will charge me that ridiculous $29 fee and I'm a super broke college kid.

Apple storage pictures and music?

I have a 16 GB iPhone and I'm wondering how you guys not run out of space. I love music and I don't love using my cellular data for it but I love taking pictures as well. The phone really only has about 12 GB and I've used up 8 I think. I don't want to worry about running out of space when I take pictures or downloading music. And should I sinc my pictures to iCloud? I heard not to do that but just wanted an opinion.

Can I use my micro sim in my HTC One in an iPhone 6?

Can I use my micro sim in my HTC One in an iPhone 6? - 1

Added (1). I'm about to get an iPhone 6 through Apple cause I don't want to have to buy a new plan with AT&T. So I was wondering if I could simply use the micro sim in my HTC One (android) in my new iPhone 6.

HE'S BACK (and this is still creeping me out)?

So a little while ago I posted a question about how the Hamburglar was stuck as my iPhone background and every time I tried to change it my phone would shut down. This is continuing to happen, but now my background is the Elmo Rise meme.

HOW TO RESTORE IPHONE IF PASSCODE FORGOTTEN?

Okay, so I changed my passcode to my iPhone and forgot it 4 hours later. I do not want to take it to apple or a store, I want to do this myself. I tried restoring it on iTunes but when I try it says "could not update "iPhone" because it needs a passcode entered, please enter passcode."