How can I get more life out of my battery please?

Here are some tips:

http://www.techradar.com/us/news/phone-and-communications/mobile-phones/12-iphon e-battery-life-tips-and-tricks-1270930

https://www.apple.com/batteries/maximizing-performance/#ios

http://ipod.about.com/od/iphone3g/tp/iphone-battery-life.htm

http://www.zdnet.com/pictures/how-to-improve-your-iphone-ipad-battery-life-ios-8 /

There are lots of users reporting serious battery issues after updating to iOS 8.3. So I think what you see should be the same.

I think, maybe you could try getting contact with Genius Bar specialist.

There are always reports of high battery usage with every iOS update. This is not surprising when there are 100s of millions of iPhones and iPads out there. I have seen no difference in battery usage with iOS 8.3 nor have the battery usage posts I have seen here been out of the ordinary.

What does "very frequently" mean

Every hour?

Every day?

Every minute?