Batter life IOS 7, iPhone 5c?

I just bought an iphone 5c last week on saturday. I love the device itself, its great, but what i don't love is the battery life. For the first week, the battery life was amazing and when i went to bed at night is was at 30%, but out of no where, my battery started draining like that, and now i'm losing 1% every 4 minutes. It happened out of nowhere for no reason. I have done all those tricks to increase battery life but is this normal and is there anything i can do?

Lower brightness and buy a mophie power PACk from apple one that clips and functions as a case or an external brick that has space for two USB it is the only way with iphone I'm afraid

So when you say you're losing 1% battery every 4 minutes does this mean while it's not in use because if you're using it while this happens that's completely normal. But if it's like that while not in use, have you turned the iPhone off completely, turned the mobile data off, made the screen brightness as low as possible and closed all the apps? If so I think the best thing to do is to take it in to Apple. If you choose to take it into Apple better have all your stuff backed up because your stuff ain't coming back!

Let me guess you are constantly texting or playing games and expect it to lose no batttery power? Lol

You can purchase a good quality cheap price charging case
http://www.amazon.com/...00DVZLF3C/

this case might not be one of those top brands out there but they does just as good as any of those good brands at a cheaper price.