I'm not one to spout technical data, but I have read a lot about it and many people say the Panasonic are best. I use the Panasonic CGR18650CH in my VAMO and it seems to work great. However, you will need to determine what type of 18650 you device needs and make sure to match up appropriately. Unprotected mods need protected
batteries (or at a minimum, a fuse-like device) to make them run safely. Protected mods generally do not need (or even function as well with) protected
batteries. If you have your manual for your mod, it should tell you recommended battery specifics as far as protected, unprotected, etc. If not, you can search the forums for your device and probably find good recommendations specific to your application. Once you have the info you need to make your choice, I purchased mine from
FastTech - Gadgets and Electronics I bought mine from there and they seem to come pretty well recommended by many e-cig users. Took my order 8 days to arrive after placing my order, even though it spent 5 days in San Franciscco en route to Florida from Hong Kong. I was skeptical about using a company in China but after a lot of research I used them and wasted 2 weeks researching instead of just going for it. I wish I had skipped all that and just bought from them in the first place. My dealings with them were all good. Good luck