It should add to your normal standby power drain slightly, but nothing to horrible. I have my headset on all day long and I still have 3 full bars at the end of the day left after I talk for about 1.5 hours worth of airtime and sending/recieving email. I use a 7520+BT800, ymmv, but I'm guessing that unless you are constanlty yapping on your phone you probably won't notice anything.
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