I just bought my first 21700 regulated mod some weeks ago.
A Hugo Vapor Urus. I use a 21700 Efest 3700mah battery with it. It's very light(77gr without batt), but it's very reliable.
Haven't had a problem with it yet.
Only con after a 6 weeks testing is that you should use a single coil atomizer with it, with dual coils (0,25 ohm) battery won't last a full day. With my Ammit (0,45 ohm) or my single coil Goon 1.5 (0,3 ohm), battery lasts good 2 days until I need to recharge. And I like the look and it's name
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