im not real sure why everybody has to run lipo unregulated. i have the 7955's and i know that the speed rating is some what slow and running them unregulated really picks the speed up but i think that they are more then fast enough with a 5 cell ni-cad pack. i have'nt seen a car yet that will respond to a extremely fast servo. i run a lipo regulated for 2 reasons #1 i can run all day long without a recharge on a 2000 ma pack #2 the weight , and if it wasnt for #1 i would proble stick with a ni-cad or ni-mh pack.