Substitute batteries

Michael Shiloh michael at
Thu Aug 21 07:49:05 CEST 2008

Joel Newkirk wrote:
> My guess is that it incorporates some constants that depend on the actual
> battery pack.  Note that I don't actually KNOW that it's in the battery,
> but previous ML posts by folks at Openmoko refer to it as 'in the battery',
> and with a bl-5c installed almost all battery-related entries in sysfs are
> unpopulated.

This is to confirm that the coulomb counter is in the battery pack. Why? 
Because it stores the count, and if you swap batteries, you need to know 
the count for the battery in the device, not for the one you removed.

> j
> On Thu, 21 Aug 2008 00:13:00 -0400, "Charles Pax" <charles.pax at>
> 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?
>> -Charles
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