Yeah, running in series or parallel paired together, use to brand new batteries and pair them as one set, mating them to make sure they are identical, charge cycles, amps, mah, brand, and model, mark them as say pair 1 for such and such mod. Being Sony VTC batteries are soon to be slim and far between being they are not manufactured anymore, there are other good high drains out there that will work made by Orbtronic, LG, even Samsung, and in your unit the LG "LGDBHE21865" Hybrid 18650 High Drains will do you real well as they last longest being drained fully before recharging them, and the mod's circuitry cut off at low voltage will keep you from draining them down fully below recharge point, and have 35amp max drain.