mmmm... no.
did you catch pbusardo's review of the DNA20?
1) 10W @ .9ohms would require 3V... unless i'm mistaken somewhere it's a somewhat discouraged practice to drain your battery that far.
2) the DNA20 kinda fails at stepdown, if you put a .9ohm atty on your DNA20 and drop it to 10W and fire, the ohm logo will start flashing and the mod will just act as a passthrough for the battery and dump whatever voltage the battery is putting out. Unless of course, your battery has drained far enough to actually allow the DNA20 to step down. If you're on a .8ohm coil, i'd assume the battery drain would need to be even lower. But with a fresh battery, there's no way it's firing a sub-ohm at 10W. Here's where he discusses that. I made the link fast-forward to this specific subject A PBusardo Review - The DNA 20 - YouTube
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