i want to purchase the battery 18650, who can tell me how to find the original suppier

There is more than one company making an 18650 battery.They are made in China. I sure dont know who made the first one if thats what your asking.The best advise I can give you is Purchase one from a reputable vender, Madvapes, Elite vaporworks,There are ALOT of great vendors that are reputable.I say this because there have been some fake protected batteries made in the past and a well known vender will not sell them.And you will be safe...I hope that was the answer you were looking for.

Thank you

sometimes ecig manufacture often output the accessories in China, of course including batteries. but finding a good one is not so easy. you have to ask for samples, then purchase a few several times. if the manufacture is reliable, you can order in bulk

What are you putting said 18650 in? Is it an unregulated 3.7v mod? Is it VV? Tube or box?

There are a lot of factors to consider when buying batteries. Do you need IMR or protected Li Ion? Button top or flat top?

Either way, my go-to supplier for batteries is typically Super T Manufacturing, good prices, good shipping, and they're quick to respond. Then again I'm an AW and Panasonic user, haven't stuck a Trustfire/Ultrafire in anything in nearly a year.

http://www.supertmanufacturing.com/id75.html