Ordered an ipv4, and it's my first device without built in battery, ordered panasonic ncr 18650 b batts with it because that was suggested by site. I will want to get a second set of bats soon and want to know what to get, I know nothing about batts. Are the panasonics good? I saw ppl posting about samsung and lg, and what about amp output for the ipv4? I plan on using a kanger subtank, have .15 nickel coils, and an atlantis 2 with .3 coils mostly.