Hey guys this is my first post so bear with me. I got a subtank nano and a sigelei mini 30w and a efest 2500mah 35a 18650 for it (and i.know these are really 20a). Heres the issue I was at the local vape store and they told me I need a protected battery(suggested panasonic) for my sigelei and that efest and other imr batteries are for mech mods. He was very serious about this. All I have read on this forum say imr are the safest all around. I figure my mod has built in safety mechanisms. I keep my eye on battery level. Did I get the wrong battery or what? Please give me all the info I need lol o yeah he also suggest I vape at 7w but I barely get any vapor At that at all. I like it around 20w.... thanks