I will have to do the test on gp 3300. I found some info on another site to.
5XL 6-10 cells
6XL 8-12 cells
7XL 10-16 cells
8XL 12-18 cells
9XL 12-18 cells
10XL 12-20 cells
11XL 18-24 cells
12XL 18-28 cells
13XL 18-32 cells
14XL 24-32 cells
My truck is a little heavy. about 14 lbs ready to run with 18 cells. Yes it was with 18 cell of gp 3700. about 25 min with 3300. I run dirt hawgs with ue rears 2 speed tranny. I have the gmaxx double extended. Mike can get you the 8 or 9xl. It will be the wanderer series by bk. same as feigao with better bearings. I will have to charge batteries up and get back to you on the run time. Batteries are charging now.
HEre is the thread on my truck.
http://www.rc-monster.com/forum/show...5&pagenumber=1