Archived posting to the Leica Users Group, 2010/07/16

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: [Leica] CPU power vs. battery life
From: ricc at (Ric Carter)
Date: Fri, 16 Jul 2010 17:16:52 -0400
References: <>

maybe more important is turning off stuff you are not using--bluetooth, 
wifi, ethernet...

don't forget to dim display


On Jul 16, 2010, at 3:59 PM, Lawrence Zeitlin wrote:

> Akhil asks:
> Can any list members shed some light on the CPU power vs. battery run-time
> trade offs involved? I have of course, asked the manufacturers' tech 
> support
> but never could get a satisfactory answer.
> - - - - -
> First be aware that all computer manufacturers lie about battery run time. 
> A
> good rule of thumb is that, in normal use, you will get no more than half
> the battery run time claimed.
> Second, CPU cycles take power. The faster the CPU, all other things being
> equal, the less the battery run time. Just how much shorter depends on a
> variety of other factors like screen brightness, disc run time, Wi-Fi use,
> etc.
> For portable use manufacturers favor chips with conservative power
> requirements rather than faster, more capable power hogs.
> Most laptop makers have a minimum battery use mode for extended portable
> operation. If you look at just what the computer does, you invariably see
> that the CPU speed is reduced, sometimes to half its normal setting, the
> disc run times shortened, and the screen turned off after several minutes
> without keystrokes.
> My experience with battery operated computers ranging from the old HP LX 
> 100
> handhelds to the latest MacBooks is that the lower the CPU power, the 
> longer
> the battery life. There ain't no free lunch.
> Larry Z
> _______________________________________________
> Leica Users Group.
> See for more information

Replies: Reply from photo at (Nathan Wajsman) ([Leica] CPU power vs. battery life)
In reply to: Message from lrzeitlin at (Lawrence Zeitlin) ([Leica] CPU power vs. battery life)