Battery efficiency questions in the context of running

Thanks !
I switched off wake on tap and voila! It doesn't turn on on its own.
To answer @Ganblejs, my settings in Runplus are:

• 4 boxes : Distance, time, pace avg, HR.
  
• notifications : buzz every 1km (shouldn't be too bad)
  my settings in Recorder:
  
• Time period 1second.
  
• Log gps, steps, bthr
  Maybe, for really long runs I should use the run app instead of the fancier runplus (I ran runplus on race day, but didn't use the second screen).
  
  

GPS is really the biggest power hog (assuming your backlight is off) but really that should last for maybe 7 hours.

Maybe it's because the screen was sometimes on, but after 2 hours, the battery gauge was red and very thin. I'll do more real life testing in the coming weeks.