Thank you 4ndy for your detailed answer, I really appreciate your effort. 
So if I’m not mistaken 17.04 was the last Android 5 update, meaning you’re upgrading from A5 to A6. Fortunately I already went through that step (I am currently running 17.06), and I don’t have the BetterBatteryStats app installed. I was mostly referring to this thread and this post on this thread and its replies, that left me wondering whether maybe waiting a little would be better. But it seems that problems are not a thing for most users, so I will give it a go and update soon!
Cheers mate! 