Will my iPhone battery get messed up?

I'm on a trip and I left my phone charging in the house by accident (I'm going to try to get a friend to take it off) but I was wondering how long can it stay charging until the battery goes bad? I've heard stories so I'm just wondering if they were true.

The battery doesn't go "bad" but it can sometimes cause the battery life to be shortened

It will decrease the battery life a little bit, but other than that, nothing else

The iPhone will not overcharge.
The only thing that could cause it to go bad is if you left it charging in the hot sun or on top of a stove.

  • Why is my iPhone screen messed up Whenever I touch my iPhone screen it goes like haywire and does random crap it almost bought me a computer I don't need please help!
  • Why is my iPhone 4s messed up? Its stuck in horizontal mode where it only shows the albums and won't go back to vertical and no it's not on screen lock I checked
  • My stupid iphone/apple/itunes messed up my phone, and now all my music is gone this is what keeps showing up. I'm supposed to have almost 400 songs and it'll only let me put 158 on my phone.wtf! Any snarky remarks and commentary are unwanted, and Yeah I'm annoyed since I paid 1000 dollars on my phone and i'm expecting the product to work properly.
  • My music on my iPhone got messed up after ios 6? Okay, so I have an iPhone 4S, and I updated my phone to ios 6 while ago. Ever since then, my music has been messed up. On albums, it appears that it doesn't have an album photo, but when I play those songs, they do have a photo. Also, there's a few songs that I deleted after purchasing it that's not fully downloaded. It won't let me delete it from my iPhone, and it doesn't sync into my iTunes, so I can't delete it like that either. What can I do?