Extended battery pack

[Al Johnson]

On Tuesday 23 September 2008, Angus Ainslie wrote:
> On Tue, Sep 23, 2008 at 9:53 AM, -stacy <slm3095om at millions.ca> wrote:
> > Matthias Apitz wrote:
> > > El día Tuesday, September 16, 2008 a las 05:22:14PM -0700, nicklogan
> >
> > escribió:
> > >> Apparently it's been used successfully with a Freerunner and even has
> > >> software written to boost the charge rate and create a desktop icon:
> > >>
> > >> http://www.millions.ca/~stacy/mintyboost/<http://www.millions.ca/%7Est
> > >>acy/mintyboost/>
> > >
> > > Does somebody know how to force the Freerunner to charge with 500mA
> > > even if it can't negotiate this via USB with the 'charger'?
> >
> > My shell script consists of three lines (two of them are output for
> > diagnostics)
> >
> > =================
> > cat /sys/class/i2c-adapter/i2c-0/0-0073/usb_curlim
> > echo 500 > /sys/class/i2c-adapter/i2c-0/0-0073/force_usb_limit_dangerous
> > cat /sys/class/i2c-adapter/i2c-0/0-0073/usb_curlim
> > =================
> >
> > If you are plugged into a Minty boost or other non-intelligent charger
> > (like my car adaptor charger) the output from the script should be
> >
> > =================
> > 100
> > 500
> > =================
> >
> > The wiki page that documents this and other "black magic" is
> > http://wiki.openmoko.org/wiki/GTA02_sysfs
>
> Why not just add the 47k resistor to the minty boost and then the
> Freerunner will choose 1A fast charge ?
>
> http://wiki.openmoko.org/wiki/Neo_FreeRunner_GTA02_Hardware#Power_Design_Re
>quirements

IIRC it was suggested this mode should only be enabled for chargers that were 
capable of supplying the full 1A. The mintyboost can't do this - you'll be 
lucky even to reach 500mA.