WiFi / Airport battery drain

Discussion in 'MacBook Pro' started by htmanning, Apr 20, 2009.

  1. htmanning macrumors newbie

    Apr 20, 2009
    I have a MBP that's about a year old. My battery was working fine and still giving me about 2.5 hours on a charge. Recently I noticed significantly less battery time (about 1:15) per charge. I calibrated the battery and had full charges on it but still would not get more than 1:15 reading on the battery meter for a full charge.

    Today, I turned off my airport and plugged into a network cable to test my slingbox. I noticed my battery meter read 2:45. It hasn't done that in about 2 weeks, and I just bought a new wireless n router 2 weeks ago. I was shocked so I started testing. When I turned the airport on and connected to my wireless g router, the battery time dropped down to 1:50. When I connected to my wireless n router the battery meter dropped to about 1:40. It seems like using the wireless over the network plug takes significantly more battery time.

    Interestingly, ever since I plugged into the network cable my battery meter seems to have been reset. I'm now getting at least 1:40 on a full charge when previously I was consistenly getting 1:15 of battery time on a full charge.

    Any explanations?
  2. iLog.Genius macrumors 601


    Feb 24, 2009
    Toronto, Ontario
    I wouldn't look too much into it. The battery meter/timer is always calculating how much power is approximately left. Wi-Fi does take up a fair amount of power which is why you're seeing the timer fall. Using the ethernet port uses less so that is why the timer goes back up. You can play around with it and see the timer go up and down but that's just the computer estimating how much power/time is left based on what the computer is doing.
  3. Warranty Voider macrumors 6502

    Aug 27, 2008
    Maine, US
    The estimated time left is never accurate. If you really wanted to see how much the airport effects the battery life, actually time it.
  4. skye12 macrumors 65816


    Nov 11, 2006
    Austin, Tx
    Yes, you have to let it run down to a very low level for the "meter" to
    recalibrate. It usually overstates how much battery charge is left otherwise.
  5. Patriks7 macrumors 65816


    Oct 26, 2008
    It's pretty simple; Wifi tends to be quite power hungry.
  6. Pagga macrumors 6502


    Feb 21, 2009
    Closer to the Artic circle than I like to be
    You could always kill a few processes instead of wifi.
    Dashboard will drain quite a lot of battery.


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