Messages in this thread | | | Date | Thu, 2 Nov 2006 10:54:17 -0300 | From | Henrique de Moraes Holschuh <> | Subject | Re: [PATCH v2] Re: Battery class driver. |
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On Thu, 02 Nov 2006, Jean Delvare wrote: > On 10/31/2006, man with no name wrote: > > In the case at hand we have mWh and mAh, which measure different > > physical quantities. You can't convert between them unless you have > > intimate knowledge of the battery's chemistry and condition, which we > > don't. > > You just need to know the voltage of the battery, what else?
The error goes way up when you do such calculations. Not that most battery hardware reports SBS Error margins right, but still...
So doing conversions is not a good idea unless it is from Ah to Coulombs or something else like that which is an exact conversion.
In ThinkPads, you just need to compare what the various "let's calculate it" applets say, and the output of tp_smapi (gets remanining time data directly from the hardware) to see which one is more accurate :-) And the difference is often quite expressive.
-- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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