Another consideration might be to focus on atomizers, 18XXX batteries might not be around for the rest of our lives, but you can be assured that some kind of battery will be in existence.
So long as you have atomizers and juice, your good to go.
Taking a look around my home I have threaded compass sets that are going on 90 years old and function perfectly, I'm not worried about threads all that much.
But I do have some electronics that you can't easily find batteries for.
Of course kanthal in a quantity to last you till your 100 would be a good idea.
Maurice
So long as you have atomizers and juice, your good to go.
Taking a look around my home I have threaded compass sets that are going on 90 years old and function perfectly, I'm not worried about threads all that much.
But I do have some electronics that you can't easily find batteries for.
Of course kanthal in a quantity to last you till your 100 would be a good idea.
Maurice