Messages in this thread | | | Date | Tue, 30 Jun 2009 20:15:47 +0100 | From | Mark Brown <> | Subject | Re: [PATCH 5/5] power_supply: add a charge_type status to the api, and use it for olpc driver |
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On Tue, Jun 30, 2009 at 11:02:39PM +0400, Anton Vorontsov wrote: > On Tue, Jun 30, 2009 at 04:57:14PM +0100, Mark Brown wrote:
> > I strongly suspect you will find that the "slow" mode there is actually > > a trickle charge. It's a lot more practical to trickle charge in mobile > > phone sized systems since the batteries are so much smaller than laptop > > batteries.
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> For a Li-ion battery, the precharge current is typically 0.1C > (C = charge rate = the charge current which will fully charge the > battery in one hour)."
Yup, that sounds like a trickle charge all right.
> There is also precharge-wait and fastcharge-wait modes, FWIW. > But we don't expose this information to the userspace.
Those *probably* boil down to one of the other states - without looking at the datasheet they sound like waiting for the conditions required to do one of the other charges to be satisfied.
> Probably not, Fast/Slow/Trickle are quite vague terms anyway. > I'd prefer if we could measure this in some real units, but alas...
Fast and trickle charge are fairly well understood terms, I think. For specific numbers you'd need to look at the particular batteries involved, unfortunately, but they do tend to be fairly obvious when looking at a particular charger and/or battery.
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