My first question would be "why aren't they being used"? I would just be guessing but if you're concerned about them holding a charge I would think they would hold one for well over a month if not more.
I hate to say I agree with Jeff but......Dammit, I do. My wife & I both use the twist and love it. I'm afraid the 14500 won't give you the battery life you're looking for and the twist is nice and slim.. My 2 cents.
Thanks for all the kind words. I hope that Christopher doesn't mind if I get a plug in and tell y'all that you can follow me on twitter (@markspens) and see the latest offerings as I make them. These can also be custom made out of whatever wood you may have in mind. You can see more of them at http://markspens.com/
The unknown here is the percentage of strawberry already in the nicotine mix. If it were me, I would set aside 10ml and slowly add other flavors to taste and note percentages of each as added. Just my 2 cents.
I looked at both of your tutorials and am very impressed! That took alot of effort to take pics and post this for our members and I think that was fantastic of you. Thank you.