My iPhone battery is acting strange?

Okay so I let my iPhone charge over night every night, its always at 100%. But today after school I was using my phone for the first time today and it randomly shuts off. I try to turn it back on but it says to out it into the charger ya know. I turned it back on somehow just to see the battery bar and it was red. I have the iPhone 3g if that helps. So I don't know the precise percentage. I'm scared my phone is going to blow up! Lol, I have it charging now but I'm scared and worried!

Smash it into wall. If that won't help, go get your iphone back to shop.

Rechargeable batteries don't last forever and your phone is now rather old.

Get the battery replaced or buy a newer phone.

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