I'm about to purchase a Vamo V3 and have been looking in here for battery info and went back about 20 pages and figured I'd just ask. I know this has been asked before. So this Vamo comes with 2x18350s. However I want to get a 18650 as well. NCR, CGR etc. I know its the chemistry but I see people mention IMR but I don't see them [on FastTech]. Also, button top or no? Protected or not? Could someone suggest a reliable/safe battery to use?