Dual Battery and 3.8?

I just picked up the second battery, and the 3.8 from tinyrc.com's online shop. Has anyone played with this combo on the ZZ yet? If it doesn't work, I'm sure the 2.6 will work really well (I have an official microsizer 2.6 that I picked up last week)

On a side note, while at a get-to-gether this weekend I let a friend who bought a microsizer borrow my ZZ NOS Motor. It hauls so much ass, and has so much torque, that it's insane. I wish I would have remembered to bring my 2.6 motor to the event but I left it at home. With NOS the little microsizer couldn't hardly turn without massive oversteer, even when we tried swapping his rear tires with various tires that I got for my zip.

on a side note, I think I'll be getting a microsizer soon enough, just to have somehing else to play with. I need to save some cash though, it's gonna start eating into grocery money. Maybe next month. My 1st priority is helping you guys figure out how to speed up the zips. I'm still working on a design for a booster board that will hopefully dump more current to the motor.

For the time being, could someone tell me if the dual battery mod works well enough to power the 3.8 with enough torque to really make it move?