Why is Safari draining my iphone 5s battery?

Phone is 4 days old, and the battery sucks. I turned off all the unnecessary features: LTE, bluetooth, app refresh, notifications, etc. I don't watch videos, don't listen to music. But whenever I use Safari the battery drops every minute. Is it a problem with the battery itself?

Yeah its true but when you stop using safari the battery % evolves. Actually the iphone battery dops depending on what app are you using