iPhone screen black, battery won't drain

Hi guys,

I'm desperate. My iPhone 4s went black screen 3 days ago and it won't turn off. I hear notifications from apps, I hear e-mails. Once the same thing happened to me but I just waited for battery to drain and recharged it again.

Now that doesn't work because battery WON'T DRAIN. And my lock button doesn't work btw.

I tried putting it in the freezer for more that an hour - the phone is still ON, I heard notifications from the freezer.

So I connected on iTunes to check how much battery I had and still have 4% for more than a day. The only last thing to try is to erase iPhone from iCloud.

I don't want to do that, I haven't backed up anything on my phone.

Anyone with similar experience?

#help