Back in the days with my Treo 650, there was a noticeable (but not severe) battery loss if I had the IR enabled (as the Palm could occasionally poll the IR receiver to see if something is being beamed over) along with Bluetooth on. As such, I always had them turned off, and I always had some insane battery life (2-3 days with light usage of both the phone and 'net were easily possible).
While Bluetooth shouldn't be a huge drain, could there be some issue with the Bluetooth stack in the Mogul that's causing the problem?
I have another suggestion for those who have battery problems - try turning on Flight Mode (turns everything off) overnight or something and see what battery drain you see (obviously charge it before you try this out). If you see any more than a 10% loss (and odds are you'll register no power loss at all), you have a bad battery.
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