Is it benefical for battery health to deepcycle once a month?

Discussion in 'MacBook Air' started by Philflow, May 20, 2008.


Is it benefical for battery heath to deepcycle once a month?

Poll closed Jun 19, 2008.
  1. Yes I know for a fact.

    5 vote(s)
  2. Yes I think so.

    15 vote(s)
  3. I don't know.

    12 vote(s)
  4. No, I don't think so.

    5 vote(s)
  5. No, I know for a fact that it does not matter.

    4 vote(s)
  1. Philflow macrumors 65816

    May 7, 2008
    Is it benefical for batteryhealth to deepcycle once a month?

    This is what Apple says on battery use for notebooks:

    My question is: is this beneficial for battery health?
    or is this only for calibration purposes?
  2. ayeying macrumors 601


    Dec 5, 2007
    Yay Area, CA
    I see no major benefits unless you have a problem with your battery. I never calibrated any of my laptop batteries, just used it as is and I always end up with great battery life and health. The only major concern I had with one of my laptop was heat. The heat basically destroyed the battery.
  3. HotAir macrumors member

    Apr 5, 2008
    Hollywood CA USA
    Seems like a hassle to have to deal with that on top of everything else. I thought batteries were beyond having to do this routine nowadays.
  4. jcb10 macrumors regular

    May 14, 2008
    I believe it does help

    I've had iBooks long enough (one from 2000 and one from 2002, with two batteries for each) to try this out and while all the batteries are now down to very slight charges, I have found that reconditioning now and then does give a small advantage.

    The second iBook was for my wife and she used one battery constantly for about a year with no reconditioning, and it's basically dead. The second battery, reconditioned regularly, has lasted for more than four years.
  5. BanjoBanker macrumors 6502


    Aug 10, 2006
    Mt Brook, AL
    I have always conditioned/calibrated my laptop batteries. The battery in my 12" PB was replaced by a recall, and the new one is still in use. I have found I have a better service life from the batteries I condition. Is it necessary? I have no idea. Has it been beneficial to me? You bet, so I do it monthly. It could be the placebo effect, but I do it anyway. :D
  6. Alkiera macrumors regular

    Mar 11, 2008
    The 2 biggest factors in Lithium Ion battery life are temperature and current capacity. Storing a L-Ion battery in a warm place while at full charge will drastically reduce it's capacity. Same temp, but at 40-50%, will lose much less. Storing it in a cooler place is always better.

    It's a good thing that the heat in these seems so focused in the CPU/power port area; I'd guess it will have much better battery life than the Dell I had where the battery got very hot, even when sitting plugged in.
  7. Darge13 macrumors newbie

    Feb 18, 2008
    Most of the post I read regarding this issue are people who leave their laptop plugged in all the time and rarely use the battery. Then one day they go to use it and get no life out of it.
  8. Philflow thread starter macrumors 65816

    May 7, 2008
    I really believe in this deep cycling once a month now.
    My battery health went up to 99,8%.

  9. portent macrumors 6502a

    Feb 17, 2004
    Absolutely Not!

    A true deep discharge will KILL YOUR BATTERY!. It is the absolute WORST thing you can do to a LiIon battery.

    Keep in mind that a "deep dischage" is not the same thing as "running the battery down to 0%. A deep discharge occurs when you run the battery down to 0% and then let it sit for a prolonged while without charging while the internal resistance drains it further.

    At this point, the battery will not hold a charge at all, or will only supply a few seconds of power before shutting off.
    (Some of you may remember the days when full discharges were necessary to prevent the "memory effect" in your batteries. This was called "reconditioning" and is not the same thing as "deep discharging" nor is it quite the same thing as "calibrating." Calibrating does not affect the power storage of the battery; it merely keeps the power gauge on the battery accurate as the battery's capacity changes over time.
  10. wordy macrumors regular


    Feb 26, 2008
    Does anyone know for certain if LiIon batteries suffer from any memory effect?

    I was lead to believe that they did not have a memory effect as opposed to others like NiMH etc.
  11. alphaod macrumors Core


    Feb 9, 2008
    No memory effect, but the cells do die and they don't hold their charges that well when put into storage.
  12. wordy macrumors regular


    Feb 26, 2008
    Thanks for that.

    One more question, does the indicated "charge time remaining" refer only to the quick charge or is it the total (i.e. quick + trickle)?

    I've noticed that the time to full charge seems to be less when charging from a depleted state rather than from say 60% charge.
  13. Mechcozmo macrumors 603


    Jul 17, 2004
    Battery information:

    You should discharge/recharge a notebook battery fully at least once a month. As mentioned previously, not a "deep discharge", but unplugging your laptop for a couple of hours to keep the electrons from growing stagnant isn't hard to do and is plenty healthy.

    Also, calibrating your battery is a _must_ to get proper readings. Just got an iBook than went from 0:40 to 0:00. Read up on Apple's site how to calibrate your Mac (Safe Sleep changed things a bit).

    My four-year-old 12" PowerBook's battery still lasts well over four and a half hours-- and it's the original battery.
  14. Mechcozmo macrumors 603


    Jul 17, 2004
    Apple recommends a 50% charge, removal from whatever unit they're normally in, and storage at (if I'm remembering correctly...) room temperature.

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