Just wanted to chime in again about my newly aquired BT headset. I charged it fully when I bought it, like I said earlier. I left it off the charger all night and turned off. Turning it back on at 6:30am and heading to work. I did my usual talking on it for the day and I have to tell you, I am very impressed. The Scala never died out or got fuzzy, even toward the end of the day.
As far as the hp6515 is concerned with BT running all day. I only noticed a slight increase in battery drain. I would have to guess at about 2-3 percent. I am extremely happy with the performance of these two technologies.