I just built a 2S2P battery pack of 340 mah Kokam cells. The completed battery weighs about 40 grams.
I have been getting around 11 minutes of hovering time, with a stock piccolo, and another 1-2 minutes in ground effect. My Triton has not put more then 600 mah in as far as I have noticed. So far I have about 20 flights on the pack and have seen no change in performance.
I have had the heli for over a year but have way more then quadrupled my air time in the past 2 weeks.
It is amazing but, I think I am beginning to see some improvement in my flying skills!