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With a 400W output, you're getting into some extreme current demands.Current demands as high as 80 Amps are calling for some pretty heavy cables. You're probably looking at 10 or 12 gauge for the battery. The high C rating 3S LiPo packs normally have cables like that already. The cables need to be even heavier for the atomizer connection as you're increasing current with respect to the power supply. You'd need something like a 40C 3S LiPo, like this; http://www.hobbyking.com/hobbyking/store/__9942__ZIPPY_Flightmax_2200mAh_3S1P_40C.htmlThat's probably going to be bigger than a Hammond box, but you need a battery that can comfortably handle 50A. You'd use similar gauges for power in and out as the RC models those 3S LiPos are designed for.Your MOSFET should be rated for at least 50A, but that's minimum. You'd probably want to parallel a couple of them. It's really quite an extreme setup, but if you want 80A available at the atomizer, that's what you need. Also, any battery rated for outputs that high is going to be pretty volatile. Be real careful about any possibility of shorts or physical damage to the battery. When those high output hobby LiPos go off, they can explode violently. A much safer setup would be a 6 pack of 30A 18650s, two parallel sets of 3 in series, it presents some complications but would be much safer.