It doesn't matter if the packs are paralleled or not, the voltage of 3 cells will fry the motor. Paralleling a battery pack is done to increase capacity, thus increasing the amount of current it can safely supply. For instance, using a 3s1p pack of Kokam 1020s (3 batteries in series, none in parallel) can only safely supply 3-4 amps without damaging your batteries. However, making a 3s2p pack (3 in series, two in parallel) will increase the capacity of the total pack to 2040, and will allow it to give out 6-8 amps without damage being done to the battery. You could put 100 packs in parallel, and it wouldn't damage the motor any more than just one. However, if you make a pack with 4 in series, you can expect you motor to last about 5 very spirited minutes before it goes dead. Check www.RCGroups.com to learn more on batteries, if you would like.

Dan