My iPhone 4 is charging after I dropped it

I dropped my iphone 4 on the floor and it cracked on back of my phone and the front of my phone from half way to the home button. When i turned it on, everything was fined and when i tried to charge it, the lightning bolt thing showed up but disappear and there wasn't a sound, but when i unplug it, the charging sound came on. I reboot 2 times and i cleaned out the charger, and it still won't charge, also it is now 11%. I need help with charging my phone.