Sorry for the bad misleading info I posted.
I posted results on how I tested my Q2, not actual specs.
Specs:
Talk time: up to 8 hours
Standby time: 10 days
Radio On time: typical 8-10 hours
That means if you use like I did, with radio on 100% and frequent talking, then around 9 hours use before we charge again.
If you do not use FM radio much, then you can talk 100% constant for up to 8 hours, or random talking for days, since it automatically goes to and from standby. For comparison, these are specs about twice as long as most cell phones, so if you have a cell phone that lasts days between charges, this will last longer than your cell phone between charges.
One advantage we found with wireless was, wife forgot something so ran back into the house while I was still on the bike. I could still talk to her perfectly, so also had her grab a snack for me that I had forgotten.