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Jan 20, 2016 11:46 PM in response to marrianstjamesby D.Cohen,I haven't seen similar threads, so I assume it's the problem with your particular phone.
Here you can find some useful tips on how to make the battery life of your device longer. They work for both iOS 8 and iOS 9.
http://www.imore.com/battery-life-problems-ios-9-heres-fix
https://www.apple.com/batteries/maximizing-performance/
However, I'd suggest that you shouldn't use the phone in such conditions:
Keeping iPhone, iPad, and iPod touch within acceptable operating temperatures - Apple Support