Why does my phone die fast and take a long time to charge?

[HelloKittyBitch.]

I have the Samsung Galaxy S3. My phone takes a long time to charge. I've never had a phone that ever took that long to charge. I can honestly say it takes about 3 - 4 minutes for one percent charge. And it also dies really fast. If i'm on Facebook for about 20 minutes it would take about 20 percent of my battery. Is this just how my phone battery is because my phone has a big screen? Or did i not brake in my battery the correct way when i first got it? The way i did it was when i first got my phone it had about 70% charge, i used up that 70% percent till my phone died and then i charged my phone to 100% but i was using it while it was charging. Did i do something wrong? I'll vote best answer. Thanks . (: