Battery Loss When Plugged In?

Discussion in 'Microsoft Surface Pro 3' started by AquaReef, Aug 25, 2014.

  1. AquaReef

    AquaReef New Member

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    Hi Everyone, long time reader, first time poster.

    I picked up a SP3 i5 256gb last weekend and have been really enjoying it. Last night I decided to hook it up to my TV and play some XCOM: EW. With the help of the USB fan that others have posted, I was able to play at 720 with medium/low settings (looked great...still working on getting Steam InHome Streaming to work from my rig).

    Anyway, after a 2-3 hour session, I picked up the SP3 (was cool to the touch!) and noticed that my battery had actually been drained to about 15%, although I was plugged in. I'll need to test it out again later this week, but curious if anyone else has had a similar experience?
     
  2. kristalsoldier

    kristalsoldier Well-Known Member

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    That's odd. But having said that I had a similar experience with my Nexus 10 when I had mine. On a low charge (say 35%), I would plug it in to the mains and watch a movie. When done watching the movie, I would invariably find that either the charge level would be the same or it would have dropped. But there was a reason for the this on the N10 - its USB charging system was/ is not good enough to charge the device over and above the power expenditure when watching movies etc. This is also the reason why the N10 takes a long time to charge.

    However, I don't think the above applies to the SP3 given its rather efficient charging solution, which is also why I think your experience is odd.
     
  3. GreyFox7

    GreyFox7 Super Moderator Staff Member

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    I recall reading that in a couple cases the power plug only charged when connected one way even though the light was on. I believe that was an issue with the charger.
     
  4. Bandito

    Bandito Active Member

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    Just how big is that USB fan, anyway??? ;)

    It is possible that with the fan running and the system utilizing a lot of resources, that you could draw more power than the AC adapter could provide (36W).

    I'd try it again, but don't use the fan and see what happens.
     
  5. AquaReef

    AquaReef New Member

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    Thanks! The USB fan was actually plugged into the power brick, as I had the USB port on the Surface occupied . Further testing is required ;) .
     
  6. Bandito

    Bandito Active Member

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    Hmm, even though the fan was on the power brick, it would still be drawing power from the same source as that going to the SP3. In other words, you're still limited to a total of 36W from the power supply, so it doesn't really matter where the load is plugged in as it is still on the DC side of the adapter and it's load would be subtracted from that supplied to the computer.

    That's the theory, anyway.
     

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