I am a newb here and and also to e-cigs, just read this whole post, I have a background in RC cars and have a bit of battery knowledge. I know that most all e-cigs use Lithium Ion which is a good battery technology especially for many recharges. The disposable ones I have not found out what they are made of but I assume they may be some kind of Rechargeable alkaline (it does exist). Whatever it is, its a cheap battery technology that can be recharged a limited amount of times, some may only last 5 recharges but someone here said they got 45 charges out of it so its luck of the draw but for $10 I would say it would be worth it to try out. Also like one of the previous posts said, a great backup if you don't have any spare e-cigs.