unable to start up freerunner after batterie was full down

Joerg Reisenweber joerg at openmoko.org
Mon Jul 14 08:06:34 CEST 2008

Am Mo  14. Juli 2008 schrieb Marco Trevisan (Treviño):
> Joerg Reisenweber wrote:
> > Am Mo  14. Juli 2008 schrieb Marco Trevisan (Treviño):
> >> Michael Shiloh wrote:
> >>> The final method involves charging the battery manually, enough to allow 
> >>> Freerunner to boot. This requires an external power supply of about 4.5 
> >>> Volts and should be done only if you feel comfortable with electronics 
> >>> and hardware and understand about short circuits.
> >>>
> >>> Let me know if you want to do this and I'll instruct you privately.
> >> Well, maybe this could be useful for other owners, isn't it?
> > 
> > We mustn't advice customers to try potentially destructive or even 
> > procedures.
> > Thus no public howto for manual charge of LiIon batteries!
> Well, I don't think that one would to that just for fun... I figure that 
>   who will try a procedure like that is enough experienced and/or wants 
> to risk with his own device.
> I'm simply saying that the method should be well documented in public 
> (since it's not the first time that occurs) underlining that it's only a 
> very dangerous "tip" and that the Om team doesn't suggest it, then 
> everyone can decide if following it.
> PS: BTW I hope I won't use it since I've ordered also some extra an 
> battery and I've some compatible ones near me; I just wanted to express 
> my idea...

Actually I don't recommend this, not even with warning note. There are better 
ways do cope with this: hotswap or external LiIon charger/other cellphone.

Battery has max chrg V of ~4.2V and max I of ~1A. Anybody needing to know more 
on it, shouldn't even think about it. The ones who think they understood the 
above: formating charge current when bat is deeply discharged shouldn't even 
exceed 50~100mA! Otherwise U might kill bat. LiIon is tricky!

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 194 bytes
Desc: This is a digitally signed message part.
Url : http://lists.openmoko.org/pipermail/community/attachments/20080714/f8e447fa/attachment.pgp 

More information about the community mailing list