as someone who owns a spider it does nothing for voltage regulating to the board. yes it hooks to the same place the power wires do on the board but, it does nothing but send voltage to the motor. as never owning a nelly or a v 2, does the power go to the v2 or nelly and then to the xmod board? that would tell you whether it bec or not. if the power goes to the v2 then an output from the v2 actually provides the power to to the board then yes it would be bec. but if it hooks to the board in the same spot the power wires do, then there is no way it regulates voltage going to the servo. the spider does not regulate voltage.
looking at the tutorial on the v2, it is set up to regulate the voltage going to the xmod board
http://www.atomicmods.com/Categories...tallation.aspx
the spider hooks to the same spot as the power wires do on the board, this way the board would get the exact same amount of voltage that the batteries are putting out. no regulation
http://shop.ausmicro.net/download/Sp...uctions_v1.pdf
looking at the tutorial of the whoa nelly this attaches the same way as the spider, thus no regulation.
http://www.woahnelly.com/images/Woah...ationGuide.pdf
having worked in a field that i had to have electrical knowledge, maintenance lead at tonys pizza, in order to regulate the voltage going to something you have to have a regulator in between the power source and the destination you are hooking power to.
v2, yes it is in between the power source and the xmod board.
spider, whoa nelly, no its not in between the power source and the board, it attaches to the same spot the power source hooks to.
the only way you would have different voltage to the board and the motor with the nelly or spider is to run them off of a separate power source. but i don't know if the voltage to them from the separate power source would back feed to the board anyway causing the voltage to be higher to the board anyway.