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I don't have a scientific method measurement of my battery performance, but I believe my Pre has better battery charge duration after the 1.1 update, that is especially noteable when the phone is idle for several hours. Bluetooth power drain is a different story.
I have two bluetooth 2.1 headsets and one 2.0 headset (all stereo). The 2.1 headsets seem to get better range of reception, but the power drain on the battery is noticeable for all the bluetooth headsets. 2.1 bluetooth is supposed to be more power efficient, but I haven't noticed any significant difference between 2.0 and 2.1. If I use Pandora with wifi and bluetooth, I get the worst power drain. Phone calls perhaps drain the battery as much as streaming Pandora via wifi to a stereo bluetooth headset. Again, these conclusions are drawn from recalling my experiences, not accurate measurments.
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