My iPhone 3 randomly turns off after about 15 minutes of usage?

My iPhone 3 that I recently bought used will only last about 15 minutes on when not connected to a charger. When it does turn off and I try to turn it back on it gives me the red bar and says I have to charge my battery even though I charge it for the whole night. The battery bar is always more than half. Any help?

Time to upgrade bro.

Your situation is that it's an iPhone 3G. I thought they stopped producting that ***.
Return it and upgrade.

Sounds like you have a lemon… Cut your losses and consider it a lesson never buy a cell phone used

Just go to iphone showroom and show with the warrenty so you can change the battery alone for free enjoy

Seriously iphone 3? You basically just wasted your money buying it. Return it and but a new phone or wait till June for the iPhone 5s

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