Why does OS7 use more battery on iphone?

Upgraded to OS7 from 6.1.4 which was much better on battery life. Why does OS 7 use so much battery and how can I reinstall OS6?
Its using approx 10% of battery life every hour, when not using the phone and all apps switched off, push notifications off etc - if I was actually using the phone and making calls battery will be dead in no time!

dyno wrote:
why?i rip all my cd's in wma,y does wma files use more battery life?
Due to higher compression rate of WMA. The player will need higher processing power to process it thus the higher battery consumption but it should not affect it very much around 0-5% more only.

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