Dna20 box mods are flooding now (fazedboxmods, dz nutz, etc). 20watt, some are self replacable
batteries, a lot of customized shape, materials, and color. I prefer dz nutz d20s myself, quite small compared to others, 2200mAh, passthru function, aluminium box, solid built, and the cheapest dna20 mods there is ($150).
Sent from my mind using the Force, or mindmelt, or whatever