Trying to give up the nasty cig's & learn more about vaping and the equip. Just got into the Smok Tech ego pass through with dual 510 carto tanks. got a few new juices from Madvapes- rootbeer, Top Banana & Creme dementhe. I don't see any pass through batteries on Madvapes site! I like the pass through idea so you can vape when the batterie is charging. I have the 900 mvh & want to order a couple of the 1000 mvh. any suggestions? Pardon my dumbness to this stuff, looking to learn.