Fast drain of battery, is this normal with ios 7?

Well i install ios 7 in iphone 4s yeaterday and i notice that my battery drain fast when in wifi mode, im only browsing the net. (im using my 4s in 15 percent of battery life then after 5 mins of using it it turns to 8%)

No! Bring it back to apple shop, as fast as you can!

IOS 7 is a bit of a resource hog and with that in mind, it does bog down the performance of the phone. One example is the battery life.iOS 7 does use more battery life than previous versions.So, in a way, it is normal but you can also said it's not normal since your iPhone can perform better. This can be software issue and hopefully, they will fix it in the next firmware update.