Why did my new Iphone 5 die within 5 hours?

I just got an iphone 5 last night and it died for a second but i charged it the rest of the night and this morning it was 100%, i even turned my brightness down and quit some apps but it still was draining,
my friend who has an iphone 5 has 80 percent still,
how can i make my battery better?

The Iphone 5 uses a lithium ion battery so the more frequently you charge it the longer it will last. There are also a few other issues surrounding iOS 6 so if you have that i would wait for the next update. If none of this helps try turning Wi-Fi and 3g off when not using it as that can still drain battery.

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