Thank you...from your statement, I will assume you use 2 aw imr 3v at 6volt on the sb. I have the aw 18650 at 3.7 volt. That works just fine. It is just the dc 1.7 with the rcr123a's at 6volts that is not firing up for me.I'm not a 100% on the RCR123a's ratings for 6v, but at 3.7 I user the AW IMR 18650 as well as the AW 2900 Protected batteries. They are both rated at over 6 Amps of power. I don't think the cartos even come close to taxing that limit. I think you should be fine with any variation of the AW 18650's for your 3.7 vaping and the if can get them get the Tenergy or AW IMR 3.0 volt RCR123a's. A good vendor is RTDVapor.com as he carries most, if not all of those batteries.
Thanks