From what I read and understand I don't think you would get much of 10 min. on a 6 cell pack .
I've been getting 15-18 min. on the 7 cells . On the 8 cells I get much more power but no notable increase for duration due to the added weight of the additional cell . Keep in mind that I'm using matched cells which seem to make a noticeable difference with duration and pack life .
The Phoenix 35 is a great choice for the configuration you're considering .
Again I'm no techie , but I do know what works for me . I also did a lot of research on these forums to accomplish exactly what your doing now and it payed off for me very well ! I'm just trying to repay the favor and "Pass it on down the line"

Mando .