Hi!
The stubby has a common issue where liquid condenses on the inside of the aluminum casing that covers the tank. Occasionally, if you wipe it with a tissue, there’s no problem. And the stock drip tip is useless, cheap plastic garbage. I use the 21700 daily. 0-24, as the flavor depletes, I change the cotton, wash the tank with hot water, and it’s good to go. The battery lasts me 2-2.5 days at 20w with Vandy Vape blue wire. It depends on how much I’m vaping. 
The tank doesn’t leak, no other problems. I sometimes wipe the inside of the cap, and that’s it.
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