GTA02 Battery Capacity (Was: Re: More about the GTA02)

Michael Shiloh michael at
Fri Feb 15 23:07:16 CET 2008

Hi Bradley,

This is all being discussed extensively on the kernel mailing list (ML).

Yes, there will be ways to reduce consumption by turning off unnecessary 
stuff. There are multiple levels of "suspension", each with a range of 
components turned on or turned off. Of course once the structure is in 
place, we will all be free to customize this to our hearts content.

As a hacker, I can do this all in code, but as a user, I would hope to 
see menus which allow you to create a new mode at run time and to select 
in quite high resolution which components you wanted powered or unpowered.

If this is a topic that interests you, I urge you to join the kernel ML, 
or at least to look through the archives of the past few days.


Bradley Hook wrote:
> How much juice does the display eat up when it's active? I assume it's a 
> considerable amount. Could we have the ability to drop the phone into a 
> minimalist mode, where all the "fluff" is disabled but bare-basic 
> features continue to work?
> For example, kill the wifi, GPS, bluetooth, and even the display. If you 
> are in a crunch and want to extend your phone's call-time capacity, you 
> could probably deal with approximating a 3 col, 5 row standard phone 
> keypad on the touch-screen WITHOUT the screen displaying anything.
> Maybe it's a silly idea, but I know I find myself stuck all the time in 
> a situation where I wont be able to get my phone back on a charger like 
> I had planned to. When it comes down to it, the Neo is a phone first, 
> and I'd rather have it act as such when I'm in a bind.
> ~Bradley
> Michael Shiloh wrote:
>> Nick Guenther wrote:
>>> On Feb 8, 2008 4:04 AM, Michael Shiloh <michael at> wrote:
>>>> Hello,
>>>> I've researched this a little, and this is what I've learned:
>>>> 1. We are still looking at a number of different batteries, so there is
>>>> no "final" capacity or feature set determined yet.
>>>> 2. The capacity will most likely be around 1200mA.
>>>> If you find any place on the wiki that says something other than 
>>>> 1200mA,
>>>> can you please make the correction? You may reference this email.
>>> Oh. That's... really disappointing. The battery life is already
>>> unusable, and the faster processor and wifi will just make this even
>>> worse.
>> We are well aware of software changes we need to make in order to 
>> improve battery and have simply not had the time to do this. You can 
>> expect much better battery life when we implement these changes.
>> In fact if you look in the archives of the kernel mailing list you 
>> will see that a tremendous amount of progress has happened over the 
>> past few days. I think the current SVN code supports a much improved 
>> suspend mode that my very simple testing suggests should last for well 
>> over 12 hours. And work continues.
>> Michael
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