Why Does My Iphone Die So Quickly?

Hi… I just got the iphone 4s two days ago… I got it in the mail and when i tried to turn it on it was dead. So i plugged it in but then it turned on like 10 mins after so then i started using it and i didn't fully charge it i unplugged it at like 70 percent… But i have noticed that it dies very quickly… It will be at 100 percent and then like 30 mins later it will be at 80 percent and i don't know why it goes down so quickly… I have made sure that apps arent running in the back round i have turned down the brightness and i have done everything to prevent it from dying so quick but nothing really seems to help… But i'm worried that since i didn't charge it all the way when i first got is the reason why it dies so fast… But please what else can i do so that it doesn't die so quickly? And is the reason why it dies so quickly is because i didn't charge it fully when i first got it?

Q: Is the reason why it dies so quickly is because i didn't charge it fully when i first got it?
A: Yes. You didn't follow the instructions.

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