That setup will have plenty of power. It should be a lot of fun on the snow.

I have a couple of those same Zippy packs. I get about 6-8 minute flights on my 3.25 pound Modeltech Magic with them and this motor:

http://www.hobbycity.com/hobbycity/s...idProduct=3887

You should be able to fly that little cub for 20+ minutes on it.

I balance those packs every time I charge them. I find that they go out of balance pretty far, but they always charge up and balance fine. They are great batteries for the money.

Good luck