I have a 7100i, which has no extended battery yet. I have Bluetooth on for 9-10 straight a day at the office. I use it to BT wireless connection to the desktop so e-mail redirection is enabled while I am at/around my desk, and that's a minimum of 8 hours almost every day.
I use the phone features and Nextel PTT very lightly on most days, say 1 hour total. I'm typically using the speakerphone with PTT, which eats more battery.
After about 9 hours, my battery is down to 55-65%, depending on how many times I actually walk away from my desk and loose BT cradling. Every time I leave that zone, and come back, it goes through a Desktop connection which obviously consumes more power then just the BT idling.
I've had no problem going a 16-17 hr with the phone dying on me, but I have not had a situation where I've been in HEAVY phone/PTT usage yet. I will buy the extended battery whenever it becomes available anyway.
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