I am about to order some new 510 attys to hook up to my Batts I get from volcano and Blu. I understand LR attys are not to be used on 510 BAtts. Question is; at how many ohms is it low resistance? I see that madvaps has 2.5 and 3.2 ohme attys. My guess is that 3.2 is standard and 2.5 is in between standard and LR or is 2.5 LR? Which is safe to use with my 510 batterie?