Is it normal for the iPhone5s to heat up just like that?

Question

iPhone

When downloading applications, the iPhone is already starting to weld a little (become warm), the other day I updated it to Beta IOS 9, it was very hot after the installation was completed, so I want to know if this is normal or not?
In normal use, there is no heating (Internet, just climb the system)
Please do not answer if you do not have this device

Answer 1

It heats up both when charging and when surfing with poor quality 3g \ lte. (warmed up on ios8 and warmed up on ios9)
You can check if you need to replace the battery here: https://www.apple.com/ru/support/iphone5-battery/