if you want to determine what is causing massive power drainage while using usb-rj45 adapter, you may want to perform the same tests that I suggested in other thread:
http://talk.maemo.org/showpost.php?p...6&postcount=35

+ do powertop tests. We should know if it's really the adapter draining too much power, or just device's CPU is active all the time + gods know whatsnot (or both).

Although, from my experience, hostmoding anything - be it just keyboard or mouse - result in device drawing much more current than it "should" (i.e. we're able to give only 200 mA to device connected to USB, so if your full ~1200 mAh battery drains in one hour when using ethernet adapter, it means that adapter itself could eat as much as 200 mAh, and device is eating rest of 1000 mAh on it's own).

Well, our hostmode implementation isn't a "reference one" - damn you Nokia for carrying about some stupid certification, and pulling out official hostmode support on the last moment. As a result, the fact that we have hostmode at all - even with it's speed limited by unknown reasons to under what's our WiFi offers, constant high-speed problems, and such - it's a miracle.

/Estel