Least Battery Expensive Tether - Wifi or USB?

Discussion in 'MacBook Pro' started by RumorConsumer, Aug 13, 2017.

  1. RumorConsumer macrumors regular

    RumorConsumer

    Joined:
    Jun 16, 2016
    #1
    I just had this idea pop up

    If you have a MBP and an iPhone there are two ways to tether - over USB or over Wifi. Oftentimes when Im tethering Im on the road as a passenger or in a vehicle of some kind.

    Scenario A: Ive got the wifi on my Mac and my iPhone and Im tether to the Mac wirelessly and the Phone is handling its own power source - cigarette lighter or battery power. Mac isn't supplying any power to iPhone but it is powering its wifi chip.

    Scenario B: Mac is connected via USB to the iPhone which is tethering over USB and unavoidably drawing current from the Mac over the same USB cable. Wifi chip is off on the Mac.

    Which of these two scenarios will drain my Mac's battery fastest?
     
  2. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #2
    Obviously B
     
  3. 2IS macrumors 68030

    Joined:
    Jan 9, 2011
    #3
    B will drain it faster, but I have Scenario C for you.

    Turn wifi off on the MacBook, keep the phone charging as with scenario A and use Bluetooth to hotspot to your phone. It will use slightly less power than wifi.
     
  4. RumorConsumer thread starter macrumors regular

    RumorConsumer

    Joined:
    Jun 16, 2016
    #4
    What is the procedure to make sure bluetooth is whats being used?
     
  5. simonsi macrumors 601

    simonsi

    Joined:
    Jan 3, 2014
    Location:
    Auckland
    #5
    Turn WiFi off.
     
  6. 2IS macrumors 68030

    Joined:
    Jan 9, 2011
    #6
    You need to pair the MacBook to the phone. Once that is done, make sure wifi is off on the MacBook, then click on the Bluetooth icon (right next to the wifi icon) find your phone and connect.
     
  7. KGB7 macrumors 6502a

    KGB7

    Joined:
    Jun 15, 2017
    Location:
    Rockville, MD
    #7
    Option D.
    Get a power inverter for cigarette lighter to power the Mac.
    Plug the iphone in to Mac via cable.
    Both are being powered and charged for around $40 for 200w inverter.
     
  8. 2IS macrumors 68030

    Joined:
    Jan 9, 2011
    #8
    If going on a long road trip and you want to avoid battery anxiety, this is certainly the best option.
     
  9. RumorConsumer thread starter macrumors regular

    RumorConsumer

    Joined:
    Jun 16, 2016
    #9
  10. 2IS macrumors 68030

    Joined:
    Jan 9, 2011
    #10
    Most cheap inverters won't be able to output their rated capacity. While that one may end up working just fine, a 200watt inverter is what, an extra $10 or so? Seems it would be worth it to me just to have that extra headroom. I have a 200 watt inverter that craps out at about 150-160 watts of load.
     
  11. KGB7 macrumors 6502a

    KGB7

    Joined:
    Jun 15, 2017
    Location:
    Rockville, MD
    #11
    There are a ton of them on Amazon.
    Car parts stores have them and so does Best Buy.

    Extra headroom is good to have and it's safer.
     
  12. RumorConsumer thread starter macrumors regular

    RumorConsumer

    Joined:
    Jun 16, 2016
    #12
    Great advice folks. Thank you much.
     

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