Actually, it wasn't in the manual. I stumbled across it online.
As far as the battery life goes, as I understand it, there's "live" mode, in which the audio from the phone is patched into the headset, "standby', where it checks in with the bluetooth base here and there, and 'off' where it's not doing anything.
I don't know how the Jabra will work on the 6035, but I'll try it out tonight on my fiancee's.
I didn't know that the 6035 will ask you if you want to answer the call -- that's really cool! But, in order for you to hear that, it would have to be a live connection. Hopefully if you put it in enhanced mode you won't have to keep it live all the time.

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If you haven't already, please vote on a bluetooth voice AND data adapter for the 7135 (that plugs into the serial port, leaving your expansion card slot free!)