Battery Life: Take Two Steps Forward, and Two Steps Back

If we look at the power consumption comparison we did in our GeForce 9300 review you'll see that the NVIDIA chipset pulls around 10W less power than G35 at idle, extending up to 15W under gaming loads. NVIDIA's 65nm GeForce 9400M used in the new MacBook and MacBook Pro is effectively the same chipset and thus it's safe to assume that there's a healthy reduction in platform power consumption afforded by the new hardware.

Apple reduced the capacity of both the MacBook and MacBook Pro batteries by 10W (60WHr down to 50WHr for the Pro and 55WHr down to 45WHr for the standard MB). Given that total platform power consumption should go down by around 10W, Apple's efforts here seem to make perfect sense. Smaller batteries mean lighter and potentially thinner notebooks; unfortunately it also means that battery life won't improve at all.

To test this theory I ran two of the battery tests I did back when the first Penryn MacBooks launched:

Battery Life: Wireless Web Browsing

The web browsing test shows that the MacBook Pro battery life remains basically unchanged, while the MacBook takes a slight hit compared to its predecessor. For all intents and purposes, these notebooks won't last any longer than the old ones.

The same thing is true about the heavy usage scenario: battery life basically remains unchanged:

Battery Life: Heavy Downloading + XviD + Web

Note that in both of these tests the MacBook Pro's GeForce 9600M GPU was disabled and only the chipset's internal GeForce 9400M was used. Apple indicates that you lose 20% of your battery life if you use the 9600M on the MacBook Pro; to test this I ran the heavy usage scenario benchmark but with the 9600M enabled:

  GeForce 9600M Disabled GeForce 9600M Enabled
Battery Life (Heavy Usage Test) 3.13 hours 2.37 hours

 

Using the dGPU dropped battery life by 24%, which is close enough to Apple's numbers to call them relatively honest. I also appreciate that Apple's 5 hour battery life is about what I got with the MacBook Pro in my web browsing test. Honesty is very important in any relationship, even if it's one between a manufacturer and a consumer.

GPU Accelerated H.264 Decode The Unexpected: Battery Life in OS X vs. Windows Vista
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  • Imaginer - Wednesday, October 22, 2008 - link

    And you have the options of the new iMirror or the new iMirror! :P

    But all iJokes aside, this article did not really had me until it is mentioned of the new trackpad. Initially, I thought that Apple went off the deep end by going from one button to NO buttons. But in the end, the right and left click is simply a finger or two down away from touching the pad to make the click.

    It is a SHAME that Anand had many troubles with the fickleness of the pad - and even moreso in Windows. Big deal breaker (alongside the annoyance of the newly adopted displayport with no included adapter (nickel and dime? at the very least monitor manufacturers include BOTH the DVI and VGA cable with each monitor, wmy not Apple?).

    Features aside, I do agree while that many (including myself) equate Apple to the USSR of the computing world, they do put together a nice OVERALL package compared to other manufacturers. Next revision Apple.... you almost had me with this one... ALMOST. Get your windows stuff and hardware support together and well talk (yes and that includes supporting ALL of your "gestures" in the Windows platform too - yeah fat chance in hell).
  • ltcommanderdata - Wednesday, October 22, 2008 - link

    The Windows issues should hopefully be fixed with the next BootCamp driver update.

    But I have to agree about the glass/glossy reflectiveness. I really hope Apple brings back a matte option, which is unlikely, or at least find some way to reduce the reflectivity in the next refresh.
  • andreschmidt - Wednesday, October 22, 2008 - link

    The first reports are coming in at MacRumors and they are definitely Samsung SSDs...didn't they use that horrible controller?
  • Voldenuit - Wednesday, October 22, 2008 - link

    "In testing the first batch of Centrino 2 notebooks that Jarred received he noted that he can't seem to find a mainstream notebook with a 50 - 60WHr battery that can come close to offering the sort of battery life you get out of the Macs."

    You're not looking hard enough. The lenovo thinkpad T400 registered 6.5 hrs with wireless on using a 56 WHr battery.

    http://www.notebookreview.com/default.asp?newsID=4...">http://www.notebookreview.com/default.asp?newsID=4...

    That's about 30% longer than the Macbook Pro.
  • JarredWalton - Wednesday, October 22, 2008 - link

    "With the T400 you can reach 9 hours and 41 minutes with the wireless enabled, screen backlight at 60%, and the laptop in integrated graphics mode using only the 84Wh 9-cell battery. In this situation the notebook is only consuming roughly 8.5 watts of power. In dedicated graphics mode under the same settings battery life falls by exactly 2 hours down to 7 hours and 41 minutes, and power draw increases to 10.5 watts. The 6-cell battery managed 6 hours and 4 hours and 28 minutes respectively."

    No mention is made of actually *surfing* the web - WiFi is merely enabled. Without knowing more about how they conduct their battery life testing, I can't say whether their numbers are comparable to ours. What I do know is that on the notebook I mentioned in an earlier comment, battery life almost doubles (142 minutes vs. 261 minutes) when I go from web surfing to idle.
  • quanta - Wednesday, October 22, 2008 - link

    The buttonless mouse is the dumbest idea. For example, if I have to press 1 finger for left click, 2 fingers on the pad for right click, how do I press both buttons? In addition, if scroll is done by moving 2 fingers, how does it not get confused with dragging with right mouse button? Furthermore, the lack of tactile feedback also reduces productivity. So much for another innovative design.
  • aj28 - Thursday, October 23, 2008 - link

    1) Why would you need to do a simultaneous left and right click?
    2) Why would you drag with the right mouse button? (also refer to below)
    3) It DOES have tactile feedback. The whole trackpad is a depressible button...

    Take your biased ideas elsewhere, thanks. Apple does good for the PC industry and provides an alternative to Microsoft-based solutions. Whether they're better or not is entirely a matter of opinion, but the bottom line is that they provide competition, and competition is good for everyone.
  • hb18 - Saturday, October 25, 2008 - link

    Another good use of simultaneous button clicks is mouse gestures in web browsers.
  • Johnmcl7 - Thursday, October 23, 2008 - link

    1 - For pasting in *nix applications, at least that's what I use on a conventional mouse.
    2 - Right click drag in Windows lets you choose the file behaviour (move, copy, create shortcut) whereas a standard left click drag will just do a default action.

    John
  • headbox - Saturday, October 25, 2008 - link

    1. newflash: this isn't *nix. There's nothing preventing you from getting a mouse either.

    2. keyboard shortcuts are faster than mouse actions. Get to know them.

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