Battery drain with USB modem

Discussion in 'MacBook Air' started by nick42983, Sep 27, 2013.

  1. macrumors regular

    May 18, 2009
    I have a Macbook Air (Haswell, i7, 8GB). I've spent the past month in Poland and while in my apartment I've been using a USB modem (Huawei) to connect to the Play 3G network in Warsaw. When using the modem my battery life on a full charge drops to about 8 hours, while when I'm in a coffee shop on wifi or just at home without the modem on, it goes back up to 14-15 hours.

    Does a USB modem really drain close to 50% more battery? Next time I'll plan to get a wifi modem, since charging my laptop every day gets to be annoying, when I bought it for its battery life.
  2. macrumors regular

    Jun 23, 2013
    United Kingdom
    Not sure about USB modems draining the battery (although I'd expect they may well do) but I know the wattage being used on my MBA 2013 just about doubles when I'm using the Thunderbolt GIGABIT connector for internet (mine says about 8-9 hours on a full charge).

    The 12 hours + is pretty much perfect scenerio: wifi web browsing so anything other than that is gonna negatively impact the hours.

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