MacBook Pro draining battery plugged-in

Discussion in 'MacBook Pro' started by onesh0t, Mar 10, 2015.

  1. onesh0t macrumors newbie

    Oct 8, 2011
    My MPB retina mid 2014 is displaying peculiar behaviour. When I'm doing a long render in Adobe Premiere it seems to seem small amounts of battery from it, while being plugged in.

    After 1hr 30m render, the battery dropped down to from 100% to 95% and resumed charging after the render has finished. I had another display of this behaviour today during a 45 min render where the battery dropped to 98%.

    What demons are at play?
  2. Samuelsan2001 macrumors 604

    Oct 24, 2013
    This is quite normal

    When under heavy load they'll draw from the battery as well as the AC power to perform, people find this a fair amount when gaming...

    Basically I think you are draining it faster than it can charge....
  3. onesh0t thread starter macrumors newbie

    Oct 8, 2011
    So in theory I can run out of battery on a really long render? That's a bit of a design flaw.
  4. Gav2k macrumors G3


    Jul 24, 2009
    Which would take 30 hours to bottom your battery out. I think your safe lol. But it's no design flaw it's smart engineering.
  5. duervo macrumors 68020


    Feb 5, 2011
    The charger won't start charging the battery until you go under 95%. Since your job ended at the 95% threshold, there's not enough data to conclude that you will drain it to 0% given a job that would run that long. The only way to be sure is test.

    Run your job for longer to observe the affects. If it continues to drain the battery at the same rate once the charger actually kicks in to charge the battery (<95%), then yes, you will probably run out of juice if the job runs for that long. If it does not continue to drain once the charger kicks in, then you will be fine.

    As it is, there's not enough to data here to say with certainty that it is a design flaw, but I personally doubt that the battery will continue to drain down to 0% with long running job. I like to think that a company like Apple (Dell, Lenovo, HP included) have tested that scenario themselves before selling their products ... but I'm feeling a bit optimistic today. Come back when I've had a bad day, and I'll most likely feel like being one of the people leading the charge with torch and pitchfork in hand.
  6. GGJstudios macrumors Westmere


    May 16, 2008
    As others have stated, that's normal behavior.

    The link below should answer most, if not all, of your battery/charging questions, including tips for maximizing battery performance. If you haven’t already done so, I highly recommend you take the time to read it.

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5 March 10, 2015