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


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