I HIGHLY recommend the Kamry eCab V2...
I have been rocking this little guy HARD, it vapes very good for around 6 hours before I have to swap the battery, nice part is, unscrew the end cap, pop in a new battery and off I go vs having to screw it into a charger and wait a few hours to recharge (and yes I do have a 4xAA size battery carrying case)
I will say this, the 2.3Ω coil is just on the outside of the "recommended" range, I would say the perfect range would be 1.8Ω-2.2Ω because at 2.3 the vape is cool but there (have to hit it harder to get a good cloud)
I would say with a good Efest or AW button top it will be equivalent to a decent 900mAh eGo battery, beautiful thing...if the battery wears out...you chuck it and pop in a new one and keep on trucking...
Here is mine with a FT topper on it...vapes AWESOME (I might rebuild the coil to lower resistance to get a little bit more heat from the vape)
My lousy picture doesn't do this little rig justice at all
Kamry -
https://www.fasttech.com/p/1372007
Mini Protank-II Style -
https://www.fasttech.com/p/1494104
Just get an few
AW or
Efest button top and kapow!
-update- Yup, I rolled a 1.8Ω coil, at 3.3vdc regulated, vapes INCREDIBLY well...wow...a little tweaking goes a long way