mac book pro 17 inch battery question

Discussion in 'MacBook Pro' started by scott905, Oct 17, 2007.

  1. scott905 macrumors newbie

    Oct 17, 2007
    I was wondering whether the battery should be left in the laptop when it is primarily plugged in,much like all of the batteries I use in my high end video gear it is better not to leave them in the charger all the time.
    With the high heat under the Mac it seems that it would be best to leave the battery out and simply re-charge it ocasionally when it runs down from just sitting,or just before going mobile with it.
    Any thoughts?
  2. pkoch1 macrumors 6502a


    Oct 3, 2007
    You're right. It's better to not leave your battery in while your computer is plugged in.
  3. TheStu macrumors 65816

    Aug 20, 2006
    Carlisle, PA
    The MacBook batteries have chips in them to prevent them from being overcharged. Just look at yours sometime... let it fully charge, and then leave it plugged in... after a certain amount of time, it will eventually slip down to say.. 98%, but it won't recharge until it is below either 95% or so.

    Furthermore, I have used my friend's gen 1 MBP (Core Duo) and it gets wicked hot, but the battery always remains cool, even after prolonged use with it plugged in... so, you should be fine.
  4. Infinity macrumors member

    May 16, 2005
    Perth, Australia
    Just so you know, if you try running your MBP via AC outlet and without the battery your CPU will only run 1GHz.

    MBP was designed to be run with the battery in at all times hence the battery makes up a large part of the case bottom.
  5. sammich macrumors 601


    Sep 26, 2006
    You can leave the battery 24/7 it shouldn't cause them to degrade over time.

    I've been keeping some stats since I bought mine, have a look for yourself, it hasn't gone down significantly, even though it's probably been plugged in with the AC and battery for about >95% of the time since I first bought it.

    Attached Files:

  6. creator2456 macrumors 68000


    Jul 10, 2007
    As has been mentioned, taking the battery out and using only AC cuts processor speed to 1ghz. It also HIGHLY increases the chance of complete power loss when the magsafe gets tugged.

    I have had my MBP since jun 06 and my first battery lasted me until may 07 when the battery update pretty much junked it. My new one is still going strong. Both were/are plugged in to the ac 90% of the time and are calibrated every couple months.

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