I'm not sure if it would take longer, but I think it would be a more relevant test for users like me who wait until the Zune is just about dead before charging it.
Also, I'm not sure about Lithium Ion batteries, but I know some types of batteries can get "memories" of the last you charged it. This means that the battery pretty much lowers its maximum charge because it "expects" to be charged at that certain level. This only happens if you do it a bunch of times, however, so you shouldn't really worry unless you do this all the time, and even IF the Lithium Ion battery does this. Once again, I know some batteries do, but I'm not certain whether or not Lithium Ions do or not.



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