Hi Guys I have one of those kangertech subbox minis which uses 1 18650 battery I am looking at upgrading to the 200 w mod or moving over to the smok tfv4 and r200. So my question is two fold one would it be safe to use the 18650 batteries I have or should I rather buy new ones and secondly which do you recommend the kanger 200 w or move to a whole new smok setup.
Thanks
Thanks