Why does my Iphone turn off with 20% battery power left

Hi
I got my iphone as a gift and so i don't have receit.
I'm wondering why my Iphone would turn power off with 20% power left.
I have other apple products  (Ipod 3 and and Ipad 2 ) and i don't find the same issue with my other products.
Just my Iphone is giving me tha trouble. sometimes i even see i have 40% battery life left and it shut off.
so i don't know if the % display show up wrongly.
what would you suggest.

Charge it all the way up, then let it run all the way down until it shuts off. Repeat this cycle to recalibrate your battery meter.

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