After upgrading my iPhone 4s to iOS8 my battery life has been cut in half

After upgrading my iPhone 4s to iOS8 my battery life has been cut in half
Mail is 44% of the battery - I get about 300 emails through MSexchange and 25 through hotmail and .25 from cogeco.
Home & Lock Screen is 19%
Phone is 14%
Calendar 11%
Is there a bug in mail or is it just too much volume?

I see the same thing after upgrading to ios8 on my iphone 4S.
In my case, Mail is 76% of my activity. Disabling my mail accounts allows me to go back to my once a day charging routine. Otherwise, my battery runs down from 100% to 9% in 3.5 hours. I have two mail accounts. One exchange based the other is gmail.

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