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Thread: Battery

  1. #1


    Member Since
    Jul 01, 2008
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    Specs:
    Macbook white, 2.4GHz, 2GB ram, 160GB hard drive
    Battery
    I expect that someone has already asked this at some time and if so, I apologise in advance. Is it wise to leave the battery permanently connected to the mains? or should it be run down occasionally. I have the coconutBattery application and it is referring to battery loadcycles. What does this mean? I obviously want to get the best life out of the battery so any advice will be gratefully received.

    Thanks

    Brian

  2. #2

    lifeafter2am's Avatar
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    Aug 25, 2006
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    90% of the time my MBP is plugged in. But every once in a while I unplug it and let it drain all the way down. Keeps the battery hovering at between 99% and 100%.
    masakatsu agatsu

    @lifeafter2am

  3. #3


    Member Since
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    Specs:
    Macbook white, 2.4GHz, 2GB ram, 160GB hard drive
    Ok, that seems a good idea.

    Brian

  4. #4


    Member Since
    Nov 05, 2008
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    ermm ive been using it without the battery connected lately didnt think it really mattered that much...hmm *note to self plug battery in when i use it*.?

  5. #5


    Member Since
    Sep 26, 2008
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    But isn't overcharging the battery bad for it?

  6. #6

    lifeafter2am's Avatar
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    Quote Originally Posted by ph!lo. View Post
    But isn't overcharging the battery bad for it?
    You can not overcharge most modern batteries.
    masakatsu agatsu

    @lifeafter2am

  7. #7


    Member Since
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    so you all plug your macs up when you use it?

  8. #8

    lifeafter2am's Avatar
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    Quote Originally Posted by kipo View Post
    so you all plug your macs up when you use it?
    Most of the time yes. Why not? I am sitting at my desk.
    masakatsu agatsu

    @lifeafter2am

  9. #9


    Member Since
    Nov 11, 2008
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    I heard that the battery's lifespan is based on number of charge cycles, not time. 1 cycle being: discharge, recharge. So wouldn't leaving it plugged in and cycling between 96 and 100%, instead of something like 10 and 100%, burn it out quicker? (or does it switch off the battery and run exclusively off the AC when full?)

    I'm on a regular MacBook (intel) and I want to leave it plugged in more often. I'm considering taking the battery out when it's running off AC.

  10. #10

    tkim's Avatar
    Member Since
    Jul 30, 2008
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    Specs:
    Black 2.2 GHz C2D, 4GB RAM, 160GB HD, Super Drive
    Calibrating your computer's battery for best performance

    The less load cycles the longer the battery will last.
    Use not abuse the rep system!

  11. #11


    Member Since
    Nov 05, 2008
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    ^ wow thanks for that link...but I still don't really understand what is classed as 'cycles' (sorry I'm a little slow at this) ><

  12. #12

    Wiss's Avatar
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    'cycle' is when battery is used up then charged to full. That is 1 cycle

    I think that's what it is...

  13. #13


    Member Since
    Nov 10, 2008
    Location
    Chicago, USA
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    Quote Originally Posted by krepta View Post
    I heard that the battery's lifespan is based on number of charge cycles, not time. 1 cycle being: discharge, recharge. So wouldn't leaving it plugged in and cycling between 96 and 100%, instead of something like 10 and 100%, burn it out quicker? (or does it switch off the battery and run exclusively off the AC when full?)

    I'm on a regular MacBook (intel) and I want to leave it plugged in more often. I'm considering taking the battery out when it's running off AC.
    For batteries using lithium chemistries the more charge the battery has the longer the lifespan of the battery. So basically keeping it plugged in as much as possible is good.

  14. #14

    iLaw's Avatar
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    Specs:
    MacBook Pro 15" (Mid 2010), iPhone 3GS
    Well from personal experience, My battery's health went down to 50% in a matter of 6 months when I left it plugged in all the time (I used to use my laptop as a portable desktop i.e. Always closed, using DVI out and bluetooth keyboard and mouse). 150 charge cycles and it was at 50% health. After getting results like this, my battery was replaced under AppleCare/Warranty because it was not performing to specifications.

    Now, with my new battery, I let it drain to 40-50% and plug it back in, doing a calibration every 1st of the month. I'm at 170 charge cycles and my battery is at 91% health.

    My Advice: don't leave it charging all the time. Even Apple says that the "ideal use would be a commuter who uses her MacBook Pro on the train, then plugs it in at the office to charge"; which implies that the batteries were intended to be drained and then recharged to "keep the juices flowing".
    iLaw
    MacBook Pro 15" (Mid 2010) + White 32GB Rogers iPhone 3GS
    2.66 GHz Intel Core i7, 4 GB DDR3 RAM, 500 GB 7200 RPM Hard Drive, Intel HD/512 MB GeForce 330M Graphics, Hi-Res 15" Glossy Screen, Mac OS X v10.6

  15. #15


    Member Since
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    Location
    Chicago, USA
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    Quote Originally Posted by iLaw View Post
    Well from personal experience, My battery's health went down to 50% in a matter of 6 months when I left it plugged in all the time (I used to use my laptop as a portable desktop i.e. Always closed, using DVI out and bluetooth keyboard and mouse). 150 charge cycles and it was at 50% health. After getting results like this, my battery was replaced under AppleCare/Warranty because it was not performing to specifications.

    Now, with my new battery, I let it drain to 40-50% and plug it back in, doing a calibration every 1st of the month. I'm at 170 charge cycles and my battery is at 91% health.

    My Advice: don't leave it charging all the time. Even Apple says that the "ideal use would be a commuter who uses her MacBook Pro on the train, then plugs it in at the office to charge"; which implies that the batteries were intended to be drained and then recharged to "keep the juices flowing".
    i have found a few rules about Lithium-Ion batteries

    * Unlike Ni-Cd batteries, lithium-ion batteries should be charged early and often. However, if they are not used for a long time, they should be brought to a charge level of around 40%60%. Lithium-ion batteries should not be frequently fully discharged and recharged ("deep-cycled") like Ni-Cd batteries, but this is necessary after about every 30th recharge to recalibrate any external electronic "fuel gauge" (e. g. State Of Charge meter). This prevents the fuel gauge from showing an incorrect battery charge.[21]
    * Li-ion batteries should be kept cool. Ideally they are stored in a refrigerator. Aging will take its toll much faster at high temperatures. The high temperatures found in cars cause lithium-ion batteries to degrade rapidly.
    * Li-ion batteries should not be frozen [37] (most lithium-ion battery electrolytes freeze at approximately −40 C; however, this is much colder than the lowest temperature reached by household freezers).
    * Li-ion batteries should be bought only when needed, because the aging process begins as soon as the battery is manufactured.[21]
    * When using a notebook computer running from fixed line power over extended periods, the battery should be removed,[38] and stored in a cool place so that it is not affected by the heat produced by the computer.

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