Re: [PATCH v2] Re: Battery class driver.

[Bill Davidsen <davidsen@tmr.com>]

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?
>
> > And it would be nice to also allow for power supply devices that use
> > other, incompatible units like "percent" or "minutes" or "hand crank
> > revolutions".
>
> Do such batteries exist at the moment, or are you just speculating?

I have seen joules (or mJ) on a laptop. Yes, it was Windows, but I bet 
the report came from hardware. Some vendor getting anal about metric?
> I
> don't quite see how a battery could report remaining energy in time
> units, as power consumption varies over time. Hand crank revolutions
> wouldn't be a very useful unit either, unless you know how much energy
> a revolution provides, and then you can just convert it. Percent would
> make some sense, but you can only express the remaining energy this way,
> not the total. And if you know the total in mAh or mWh, you can multiply
> by the percentage and you get the remaining energy in the same unit.
>
> --
> Jean Delvare


--
Bill Davidsen <davidsen@tmr.com>
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