Why is this iPhone not charging?

Got a customer phone (a friend) and the complaint was first that the screen was cracked. When I went to pick it up the customer said that now it doesn't turn on. I figured it was because of the broken screen. I didn't have the screen in stock so I gave them a loner phone and went on to order a new screen.

At this time I put the phone through a couple charge cycles and then I started hearing an alert noise. When I put the phone on silent the noise stops and it turns to vibrate. I figured there was an alert on the screen but since the screen isn't working I can't see what It is. During this time the iPhone was getting hot. Then I plugged it in a computer and iTunes recognized it and prompted for a password. So I know it's getting power and works with a computer so I ruled out the logic board.

The screen will be here any day now and so I went to charge the phone up again and now it's not doing anything. I've tried two different chargers and it does nothing. I plugged it in the computer and nothing.

One more thing I did was clean out the charging port and it still does the same thing. My best guess is that something is wrong with the battery. But I thought I would ask around before buying a new battery.

What do you think it is? Is there a common fix?

Is the charger of your Smartphone is working or not? As I face the same problem and detected the faulty charger. To overcome this issue I purchased a 6 Port USB Charger from Amazon http://www.amazon.com/...B00MBDGVPM through which I can charge up to 6 Android as well as iOS based Smartphones. You can check your charger before replacing your batter.