Why my iPhone 4 is taking a while to charge?

My phone usually charges VERY fast even when I'm using it and apps are open. Lately, it is taking a VERY long time to charge and sometimes does not charge at all. It takes like fifteen minutes to charge 1%. I've been using different chargers. I had a really long one my mom bought me and then when it started charging slowly, I used my old ones and my mom's which all did the same thing. I got this phone December of 2010.Is it possible I need a need battery? How much would it cost?

The connection from your phone might be messed up, and you can't really change its battery, so you'll have to buy a new phone.

The charger that came with the phone was MADE for it, i've noticed that if i use any chargers other than the one made for it, my phone charges really slow.

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