MBP AC power

Discussion in 'MacBook Pro' started by brentg33, Aug 10, 2008.

  1. brentg33 macrumors 6502a

    Joined:
    Mar 5, 2007
    #1
    Hi, i have a mbp for a year and half or so now and this week had to get a new battery.....the old one wasnt lasting very long...i believe it only had about 15 cycles on it...i used AC power almost always....so now that i have a brand new battery....and use my mbp primarly at home...how bad is it to use AC power most of the time?
     
  2. kolax macrumors G3

    Joined:
    Mar 20, 2007
    #2
    No - but it doesn't help the battery health if you only let the battery go to 50% then start charging it up again.

    If possible, when using battery, let it go down to as close to 0% before you plug it back in again. I know in real life circumstances this isn't always a possibility, but it does help with the life.
     
  3. brentg33 thread starter macrumors 6502a

    Joined:
    Mar 5, 2007
    #3
    but after its fully charged again....should i stop AC power and run off the battery? or can i continue to run AC eeven after 100% chg?
     
  4. kolax macrumors G3

    Joined:
    Mar 20, 2007
  5. Fabiano macrumors regular

    Joined:
    Jan 30, 2008
    Location:
    Palmas, Brazil
    #5
    if you use it plugged most of the time, you can keep going like that, but be sure to calibrate your battery once a month.

    how to calibrate your battery: http://support.apple.com/kb/HT1490
     
  6. merl1n macrumors 65816

    merl1n

    Joined:
    Mar 30, 2008
    Location:
    New Jersey, USA
    #6
    I use mine connected to A/C 95% of the time (I drive an external 23" Cinema Display which needs the A/C power). My MBP is 18 months old using the original battery. I've only re-calibrated my battery 3 times and it still measures 93% capacity at 5 cycles.

    I think "once a month" is overdoing it and time consuming. Every 6 months would seem more reasonable.

    Just my 2 cents. :)
     
  7. Fabiano macrumors regular

    Joined:
    Jan 30, 2008
    Location:
    Palmas, Brazil
    #7
    Well, its Apple recommendation, so they should have a good reason to say that.
     
  8. merl1n macrumors 65816

    merl1n

    Joined:
    Mar 30, 2008
    Location:
    New Jersey, USA
    #8
    Where does it say that in the KB article you supplied?

    Every "few months" is not "every month".
     
  9. kolax macrumors G3

    Joined:
    Mar 20, 2007
    #9
    Calibrating the battery just for indication purposes and doesn't actually affect the health at all.

    I haven't calibrated my battery for ages, and even though my MBP said I had 10 minutes left, it actually lasted for about 40 minutes before going to sleep.
     

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