I keep my MBP mostly connected to a power source.
I know this can be detrimental to its battery life - so how often should I unplug it and let the battery drain?
Should it drain completely - only to 50% etc? Any advice there?
I never let my MBP stay plugged in if its fully charged and I calibrate the battery once a month. I ruined 3 MBP batteries on my last machine by leaving it plugged in all the time.