My iphone won't charge at all?

I've tried everything re booting and restarting and its still on 48% but i need it for tomorrow and i'm scared it's just going to die on me. What shall i do? And i don't have the screws to unscrew the bottom of the phone.
If i ask the apple shop tomorrow do you think they will charge me for it?
What is the cause for this problem anyway?
It's an iphone 4s, it won't connect to itunes and yes i've tried different wires and sockets.

I would try just leaving it for a while on the charger.

Hold on to both the power and home button. Don't slide it off, it'll go off but itself.

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