Your right I had volts all in my head from the previous issue and volts is directly related to current. I am worried about the current thats why Im lowering my voltge because I dont have room to make the resistance big enough in the coil. So it seams like the. board can handle 7.4V in that ill be using it will just take more current from the battery but will not effect the voltage going in to the motor shield.
So I think I need to turn the one red and one black battery wire into two red and two black to put two in the motor shield and two in the Arduino vin/gnd unless there's an easier way possible going from the motor shield 5V to the Arduino. This may be an absurd thing to say and totally wrong forgive me.
I don't have any decoupling I don't think not entirely sure what that means I know you posted the link on it and Ill look more into but for spikes I may need to address that as well. I've heard the words relays and transistors capacitors I sound like an idiot saying that haha but maybe one of those things are what I would need to incorporate
the motor shield Im using is that one just posted. This is more in depth information on the 2.0 version I have the 2.3 but I think its pretty similar
And I'm not sure exactly how strong I need it to be but I think this should be enough and if not ill make adjustments