Document with answers to most popular battery-related questions is ready

Michal Brzozowski rusolis at
Sun Aug 2 21:20:39 CEST 2009

2009/8/2 Paul Fertser <fercerpav at>

> Michal Brzozowski <rusolis at> writes:
> > 2009/8/2 Wolfgang Spraul <wolfgang at>
> >
> >     Hmm, that's a pretty strong statement.
> >     At Openmoko we spent _a lot_ of money combined to get this CC thing
> to work.
> >     The theory was that you have it in most notebook batteries so it's 'a
> good
> >     thing to have'.
> >     But if it's not actually used, then it would be one of those many
> things
> >     we did that should have been better thought through.
> >
> > No, I think it was a very good decision. Not only low-level
> > programmers need it, but also normal* users who want to know how
> > long the battery lasts with certain configurations. I know for
> > example that with gsm on it lasts about 50h in suspend, with gsm off
> > about 100h
> Hm, there's probably something very wrong with your config, no?
> With GSM on in suspend it should last for 140 hrs and with off it
> should be even more.

Really? Isn't that with deep sleep on?

> Hm, so basically your point is that CC allows current measurement in
> suspend. Ok, but if there're convenient TPs you can use your DMM to do
> the same as well. Also you can do that by connecting the device via
> DMM to a lab PSU or a pack of AA batteries. Moreover, there's quite a
> limited number of usecases (wrt power-management) so those who has
> some EE skills can do the measurements once and then share the info
> for everybody.

 Paul, of all those acronyms I only understand AA batteries. I said I'm a
normal user :-)
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