Maybe a little OT, but take a look at this. That is innovation IMHO
Top Quality With Carbon Fiber Covered Dna 40 Clone - Buy Dna 40 Clone,Chain Reaction Mod,Dna Chip 100 Watt Product on Alibaba.com
1) Carbon fiber battery tube, more beautiful and durable.
2) Airflow holes at the bottom thread, to dissipate heat.
3) Red bronze used for all connections, to improve its conductivity.
4) Manual battery with buttons, power 7w-50w adjusted by upper and lower button.
5) American engineers idea
Looks like a 26650 riff on a Zen ZNA, sans USB charging as well. Cool looking though.