IPhone 4 Won't Hold A Charge?

I have an iPhone 4 that won't hold a charge. It seems to die 5x faster than a normal iPhone. And when it does die, It dies completely (Meaning it won't even flicker the dead battery sign) and the only thing that will even get it to turn on is my iHome. Nothing else will even give it the charge to turn on except that, but once it is on, anything with charge it. Anyway, 1 day I was leaving the house and plugged the iPhone into the car USB plugin and something happened when i did because my iphone started to smoke and turn off. (Which i know is why it won't hold a charge). I thought maybe the battery was damaged, so I replaced it, but that didn't fix it. Does anyone have a solution? Is there chip in the iPhone that controls the battery that I should replace? Or any chip at that?

Wake up, iphone sucks, get droid

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