IPhone 5s IOS 8.1.1 battery drain using mail

Problem: battery drain is unacceptably high with -1% per five minutes
Description: after upgrading from IOS 7 to 8 the battery drain on my iPhone 5s (32GB) has hugely increased. Several tips on the internet have been tried from turning off several services to reinstalling the IOS none with no improvement. After reinstallation the drain was acceptable only to result in again a -1% drain per five minutes after a week.
Expected: using IOS 7 I could easily use the iPhone throughout the whole day with -1% per fifteen minutes. After installing an improved IOS one would expect similar or lower battery drain
Tests: as said, severals tips found on the internet have been tested none with any improvement. Deleting all accounts under "Settings->Mail, Contacts, Calendars" proved to be the only solution for this problem (a non-functional solution I must add since I'm using this iPhone for communication...). Even keeping the iCloud account but disabling all iCloud services did not improve the situation, only a real account deletion worked.
Question: do you know how to get battery drain back to -1% per fifteen minutes whilst maintaining my iCloud and Exchange account using IOS 8.1.1 on an iPhone 5s (32GB)?
Kind regards,
Ronald

Since upgrading my iPhone 6 to iOS 8.1, my battery has not been the same. I was able to get 9-10 hours of usage before and am lucky to get 6-7 hours. AppleCare thought that was on the low side and told me to visit my local Apple Store for a thorough diagnostic testing of the battery. My appointment is tomorrow. Will report back.

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"        ""                     Passbook updates: OFF
"".       "                      Reading list: OFF
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It's draining noticable faster - battery drains faster than it charges now so that unless you turn off the screen you end up with less charge than when you docked it. Same goes for regular 30 pin cable to 1Amp wall charger without the dock.
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Even with the screen dimmed back to 50% (like I had it set for ios 6),
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Thanks,
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