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  1. #1
    WilliamC
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    Battery Life and backlit Keyboard
    Does having the backlit keyboard on lower the battery life. Also i am intrested in adding a 7200rpm notebook harddrive can i do that? and will it lower the battery life?


    Thanks
    William C.

  2. #2

    rman's Avatar
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    Cool
    I don't know about the back lighting, but replacing a 4200rpm drive for a 7200rpm drive will definitely affect the battery life. Even installing a 5400 rpm drive will affect the battery.
    Life isn't about waiting for the storm to pass, It's about learning to dance in the rain!

  3. #3
    m1k
    Guest
    I would guess the backlight would lower the battery life quite a bit if you had it on all the time, because it does on iPods and cell phones, which use the same lighting substance (I think). As for the hard drive, it will definitely affect it, but if you set the hard drive to spin down after a period of inactivity it shouldn't be too bad.

    Good luck!

  4. #4


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    the backlit keyboard is only on when it senses dark conditions. You can't manually enable the backlit keyboard on your own. The only time mine is ever on is when I am near a power outlet anyways.

  5. #5
    WilliamC
    Guest
    The HD is user replacable though, right? Hmm, not what i expected as far as battry life my win xp notebook had a 5400rpm and i replaced it with an hitachi 7200rpm and it had no affect on battery life guess macs are different in that sense.

    Edit: Theres no battery loss because i am using the Hitachi drive and apparently uses the same power consumption as a 5400.

  6. #6
    ldj
    Guest
    can u replace the internal mac HD?

  7. #7
    tariq
    Guest
    upgrading to a 5400 or 7200rpm drive WON'T reduce battery life, there are quite a few benchmarks which prove there is almost little to no difference.

    yes the hard drive can be user replaced, but it is quite difficult and voids your applecare warranty if not done by an apple service tech. search google or check apple's support site if you need instructions

  8. #8
    PowerbookG417
    Guest
    you bet the HDD is replaceable like tariq said and if you wanna do it yourself..its not that hard...just becareful...here are step by step instructions on how to do it yourself
    http://61.194.6.236/pbg417h1.html

    - to address the backlight keyboard..it is different than the ipod, the ipod uses LED's where as the backlight on the powerbook is fibreoptics, but yes it is going to cut down your battery time forsure, my suggestion is really to only use it when in a dark room...most of the time you can see the keys just fine under low light and turning the backlight on just a bit causes it harder to see anyways...plus if your using your book alot you get really use to the keylayout and not often need the backlight...what i will do is keep it cranked out to max brightness and use the off/on key to trigger it when needed

  9. #9
    WilliamC
    Guest
    excellent thats what i wanted to hear. Does anyone know how CPU throttling works on the macs. Is is the same as PC's., ie. when on battery it reduces it a couple of hundred MHz.

    Thanks for all the help

  10. #10


    Member Since
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    You can ONLY use the backlit keyboard in low-light situations, PowerbookG417.

  11. #11
    m1k
    Guest
    I don't even look at the keyboard when I type at all, I know the keyboard layout that well. I think a lot of PowerBook owners (being complete computer nerds like me) know the layout of the PowerBook keyboard perfectly and therefore don't need the backlight feature at all. Apple should have incorporated the backlight into the iBook, since most entry-level 70-year-old grandmas buy iBooks than the 17" PowerBooks. Grannys probably need to look at the keyboard all the time, whereas most people who are crazy enough to buy a 17" PowerBook know a hell of a lot about programming and computers and don't even look at the keyboard when they're typing.

    Sorry, I know that had nothing to do with the topic at all

  12. #12
    MoltenLava
    Guest
    Quote Originally Posted by tariq
    upgrading to a 5400 or 7200rpm drive WON'T reduce battery life, there are quite a few benchmarks which prove there is almost little to no difference.
    In general, 7200rpm drive has higher power consumption than 5400rpm drives. In this case you can't change the law of physics. With higher power consumption, the battery life will be reduced.

  13. #13


    Member Since
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    I know my layout very well. One thing I use the backlit keyboard for is I leave my laptop next to my bad and listen to streaming loveline. Once the show is over I usually just lean over and hit the mute button since my screen is off and I'm close to falling asleep.

  14. #14
    WilliamC
    Guest
    Quote Originally Posted by MoltenLava
    In general, 7200rpm drive has higher power consumption than 5400rpm drives. In this case you can't change the law of physics. With higher power consumption, the battery life will be reduced.
    You don't need to change any laws of physics to achieve that goal all you need is a simple thing called optimization. These drives are designed to consume as much power as a 5400rpm. Apple themselves achieved this with the 5400rpm they have some adaptive power implementations that result in about as much of a power consumption as their 4200 rpm. Research it.

  15. #15

    rman's Avatar
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    Cool
    The new 7200rpm drives may use less power, but the older 7200 rpm may not. That is the problem.
    Life isn't about waiting for the storm to pass, It's about learning to dance in the rain!

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