IPhone 5 battery issue (stays on 1% for long time)?

I've bought an iPhone 5 three days ago and i didn't know how to charge it the first time so i searched it on internet and i found that i need to charge it when i get it out of the box. I hope this is right. So i did it. When it was charging i did an update. When the update was done, was my iPhone almost fully charged. After 10 min. It was fully charged. I used it for like 5-6 hours. My battery was already on 4%. After 10-15 min there was 1% left. And i was able to use it for 30-40 min! Is this normal? What did i wrong?

This happens to me too! I thought I was the only one. I've had mine for a month now. I'm guessing its normal, because the 5 is suppose to have a long lasting battery. Why are you freaking out haha? That's a good thing.