Is my iPhone battery permanently ruined?

I have an iPhone 4, and I know what I did wasn't the smartest, but I'm hoping my battery hasn't been ruined. So I took my phone off the charger at 99% because I had to go somewhere and couldn't wait any longer. I worried that doing that would hurt my battery, so when I got home, my battery was at 97%, and I thought I would put it back on the charger to finish completely which I hadn't allowed it to do before. Now, my battery percentage is going down easily every minute when before, 100% would last me about five minutes, on Facebook and listening to music. What to do? Is my battery all done and will never fill up again?

IPhone 4 batterys won't mess up that easily. You must be exaggerating or over reacting.

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