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Subject: Re: Do you have an FM Recorder? Help me with measurement values for charging code!
From: Fred (
Date: 2003-01-26

I'd love to help you, but just say me how to do those measures ...
Thanks a lot for helping us, I'll measure the voltages as soon as you say me
how to do ;)


"Uwe Freese" <> a écrit dans le message de news:
> Hello,
> I wrote the current charger code and I read here that charging is not
> working correctly with FM Recorder because of the LiIon battery. I'm
> willing to change/add the code needed for the FM Rec., but I need some
> input.
> So if you have an FM Recorder, you can help me:
> - What is the maximum voltage the LiIon battery has when it's full?
> - What is the voltage when the original Firmware shut's off the AJB and
> says it's empty?
> - Charging LiIon is usually charging with a constant voltage. It may be
> that the FM Recorder has an other circuit in it and it charges the
> battery the whole time (when charger plugged in).
> Can someone measure if the battery is charged the whole time with the
> original firmware? (measure the charging current and the voltage if
> the battery is already full)
> - To show the correct battery level percentage, I need voltage values
> over a complete decharging cycle.
> Please charge the battery with the original firmware, unplug the
> charger, start Rockbox, play back music and go to the debug menu
> (battery menu). Write down at about 20 voltages over the complete
> decharging cycle like this (it needn't be exactly the same intervals):
> 0:00 5,5 V
> 0:35 5,4 V
> 1:02 ...
> ...
> 10:00 4,5 V (shutoff)
> Thanks for your help!
> Bye, Uwe.

Page was last modified "Jan 10 2012" The Rockbox Crew