Substitute batteries

Harald Welte laforge at
Sat Aug 23 16:05:36 CEST 2008

On Thu, Aug 21, 2008 at 12:13:00AM -0400, Charles Pax wrote:
> On Wed, Aug 20, 2008 at 11:29 PM, <freerunner at> wrote:
> > OK, I have a few Nokia batteries laying around, BL-5c and BL-6c, and
> > desktop chargers.  They power the Freerunner fine, and seem to charge when
> > they're in the FR plugged in.  But the Freerunner doesn't know what to do
> > with them apart from that, presumably since they lack the Openmoko coulomb
> > counter circuit.
> The coulomb counter circuitry is in the battery? Why isn't this on the board
> itself?

because the charging state is a property that is inherent to the battery, not your device.

imagine you remove a 50% charged battery and insert a 90% charged battery.  if
the coulomb counter was on the mainboard, it would still think 50% after you
put in the 90% battery.

- Harald Welte <laforge at>         
Software for the world's first truly open Free Software mobile phone

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