Nokia BL-5C (was: Re: Broken battery protection circuit) problems?)

Tobias Diedrich ranma+openmoko at
Mon Jul 7 21:31:14 CEST 2008

Tobias Diedrich wrote:
> With this battery I could now switch the Freerunner on again.
> Apparently it is also being charged by the pcf50633 power
> management controller:
> After switching it on, the battery volate according to
> /sys/devices/platform/s3c2440-i2c/i2c-adapter/i2c-0/0-0073/battvolt
> was 3.867V, chgmode is 'fast' (usb powered, 500mA).
> Now battvolt is 3.972V (still charging).
> Looking at dump_regs and the pcf50633 manual, use of the temperature
> sensor is disabled, battery float voltage is 4.2V.
> MBCC1 says "charger enabled, automatic charge termination, automatic
> charge resume, max 60min. precharge, max. 6 hours charge"
> Also, as expected without the coulomb counter,
> /sys/devices/platform/bq27000-battery.0/power_supply/bat/status says
> "cat: read error: Timer expired".

FWIW, battvolt is now stable at 4.171V, chgstate still says
"enabled usb_present", but according to MBCS2 the controller is now
in "Battery Full mode".

Tobias						PGP:

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