I think it is working out by them sending me two 18350's to replace the small green battery's. But sure as the world is round I am going to like vaping at the higher voltage and have to order two more 18350's
You are going to have threads exposed with 2 18350's on a MRS V2, it won't screw down all the way. Not to mention the 8.4 volts on fresh batteries, you better have some 5 ohm atties and even then it is to much voltage for them. No need to go above 6 volts unless you are going VV. Get the short tube to use a single 18350 @ 3.7 volts and LR atty so you don't end up with 2 more batteries you cant use. MadVapes is going through growing pains, they just doubled they're warehouse Sq. footage and Simone moved away so they have a new CS lady who is still learning the ropes.
Hang in there!