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I've been curious about this for a while. Supposedly, WM6.5 had better power management and battery life than WM6.1. I wonder, is this the case with Android?

Generally, we can expect to get worse battery life with a ported OS than one built natively, at least during the opening phases of development. But I noticed on my wife's Sprint Touch that her device, underpowered as it was, seemed to get as good (if not better) battery life under Android as it did under NFSFan's WM ROM. This prompted me to wonder: if we actually nail power management, could Android have better battery life than WM? Or is it a more power-hungry OS in general?