IOS 8.3 is draining my iPhone 6 Plus battery life. how to downgrade to iOS 8.2?

I never changed my mobile phone using habits. All that changed recently is my iPhone 6 Plus getting an iOS 8.3 update. I noticed my battery life draining quicker than the usual. It used to still have enough juice to last me until midnight, now by lunch time i am already at 63%!
Anyone experiencing this?
Know the proper legitimate way to downgrade from iOS 8.3 to 8.2? Prefer to have longer battery life than have this updated 8.3 in my phone. I don't feel the benefits of the upgrade to begin with.

The rate of battery loss is still slowly accelerating. At this rate I expect less than 8 hours usage time.
I wrote a review of my new iPhone 6 Plus here and brought up the issue:
http://lerner.net/dougs-review-of-his-new-iphone-6-plus-first-day-impressions/
If anybody has any ideas, or comparative battery life results, please let me know.
Thanks,
doug

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*CREATIVE specifications.
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Thank !Message Edited by hippon2 on 0-8-200707:34 PM
Message Edited by hippon2 on 0-8-200707:36 PM

ok, I will tkae that under consideration. Now I have another battery issue, after fully charging the MP3 player I noticed that the battery life drain rather quickly while it is off. I lost 9% of it's charge from taking it off the charger at midnight and then plugging it into the usb port of my computer the next morning at 10:00am. The clock is turned off so it should not be doing anything for those 0 hours.

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