You have to watch for Hot Battery
I have been running Boinc on my Note 4 since last November and it works perfect-running only when the screen is off.
However 2 things to be aware of :-
1. Battery usage rockets.
2. Battery gets hot and can reduce its life
Understandable when the phone is working at 1005 (ish) nearly all the time.
Biting the hand that feeds IT
