But is the 26650 really a much longer run time then a 18650?
It's not incredibly longer but is longer.....most would be happy with the 18650 I think.....I just prefer the bigger battery mods myself most often regardless of size though not like the 26650 MCM is that large but is larger.
Remember too the higher wattage your running all the way up to potentially 20W the quicker your battery will need swapped out. I'm thinking I can drain around 6-8ml at a setting of around 12w on a single 1.5-2ohm coil on the big battery(26650)....just a guess.....usually I pay attention more to my volume of juice per charge than time vaping....easier measure for me to understand or make sense of.
When I had my 18650 MCM I was more than fine with the battery life it provided....I like them all.

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