The type of batteries we use for vaping are 3.7 (or 3.6) volts. If I remember correctly, the 3.2 v batteries have a different chemistry and are not currently suitable for vaping.
3.6/3.7 v is the average voltage of the batteries we use. A fully charged vaping battery will be at 4.2 volts, and most mods will say 'battery low' at around 3.2 or 3.3 v.
The key point here is that not all 18650s can be used for vaping. It's best to use one from Mooch's recommended chart:
Mooch's Recommended Batteries | E-Cigarette Forum
The blue row in the chart lists some reliable vendors. It's good to buy from them because they're much less likely to accidentally sell you a counterfeit battery that will vent when you try to use it. As I see you're in Toronto, I'll also mention that Dashvapes says they get their batteries from one of the recommended suppliers (Illumn.com) in case you want to avoid customs. I've always been satisfied with them.
awesome, its always nice to have reliable information and reliable sources
@sdennislee's video is a great place to start if you're looking to learn more. If you'd rather read, I'd recommend
this post by Baditude.