Battery life & case design

steve steve at
Wed Jul 2 02:33:44 CEST 2008

Well conceptually there are these options.

1. Humped backed whale. A battery that fits our slot mechanically but is
   Custom battery and custom back panel. 

2. Tethers. Tether power into USB from external source. Tether power into
the battery slot via
   crazy rube goldberg device.

So, conceptually those are the options. 


-----Original Message-----
From: Diego Fdez. Durán [mailto:diego at] 
Sent: Tuesday, July 01, 2008 3:04 PM
To: List for Openmoko community discussion
Cc: steve at
Subject: RE: Battery life & case design

El mar, 01-07-2008 a las 13:22 -0700, steve escribió:
> A deeper back cover is an option. The cad files are open. I also 
> thought of an external battery pack

What about this: ?

The specs says: Output power: 6.58 Volts - 320 mA (max) in direct sunlight.
Can it power the FreeRunner (power no just charge) ?

> ( maddogg sent me some stuff on it). Lots of ideas, too little time
> Steve
> -----Original Message-----
> From: community-bounces at
> [mailto:community-bounces at] On Behalf Of 
> jonathan at
> Sent: Tuesday, July 01, 2008 7:17 AM
> To: community at
> Subject: Re: Battery life & case design
> Mikko Rauhala wrote:
> > ti, 2008-07-01 kello 14:35 +0200, Arne Zachlod kirjoitti:
> >> Im not sure, but I think with an even thicker phone there will be 
> >> more no-geeks who dont care about the freeness who wont buy the 
> >> phone only because its thick and heavy (and such a phone would be
> >
> > Actually reading the text you would have noticed he was suggesting 
> > for someone (maybe Openmoko, maybe not) to produce a large battery 
> > back as an optional accessory, so your criticism misses the point
> >
> > For myself, I would be at least somewhat interested (depending on 
> > bang per buck, of course; it's not a must-have for me), for largely 
> > the reasons the OP mentioned. That is, simply for getting to have 
> > more of it on more of the time doing useful stuff.
> >
> > Power management is obviously important regardless, as is getting 
> > decent standby time with the default battery. (If anyone would like 
> > to offer a short summary to the community on how cpufreq and suspend 
> > are progressing, that would be interesting.)
> >
> Thankyou, that is exactly what I was suggesting.   For instance, I was
> pretty
> excited over the ideas for the mybot program (is that what its 
> called?) having a phone that alters its behaviour based on GPS and where
you are....
> I'd like to take that idea further and include WIFI so the phone also 
> knows where it is based on what SSIDs it can find.... but can you 
> imagine how long the phone would last with GPS and WIFI turned on??  
> kind of makes the idea a no go.
> Which is a shame as such functionality really goes a long way to make 
> the phone a transparent and intelligent technology which you'd quickly 
> be lost without... also its something that most other if all other 
> phones do not do....
> So in short if there is anyone who has the means to mass produce a new 
> deeper back cover for the phone so we can have a large battery in it 
> then I think it would be in our interest to pursue that.  I'm sure as 
> time goes on there will be many other great software ideas for the 
> openmoko/gta02 that will require the goodies to be switched on at all
> I've had a gta02 for a few days now. It really interested me as a 
> platform for my various codings.  My old mobile was a P.O.S so I 
> started using the
> gta02 as a phone straight away (which is fine with some tweaks).  
> However, already I have the habbit of getting to work and plugging the 
> gta02 into my PC's USB port.... thus whenever I leave the office for a 
> while I usually leave my phone behind which completely defeats the 
> idea of a mobile :-)
> Regards,
> Jon
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Diego Fdez. Durán <diego at> | GPG : 925C 9A21
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