I was running TP 1320 mah 3 cell packs and only getting about 7-8 minutes. I'm getting at least 13-14 min. flights with the 400, and that's all 3D flying. I feel that anything over the 1320's will be too much weight.

On a side note, It seems that the area where the esc and battery goes dosen't get very good airflow. I am going to open up a few air holes in the bottom of the cowl to see if I can get more flow. If I can, that should add a little time too.

Chris