Yeah there's some terminology confusion these days, but to summarize, a "hybrid" like the SMPL bypasses the 510 connection so your atomizer makes direct connection with your battery's positive terminal. This is good (in theory) because it'd reduce voltage drop. For
most people, the voltage drop it reduces won't even be noticeable. I suggest just staying away from anything with a "hybrid topcap" of any kind. They're kind of unruly.
Additionally, someone earlier in the thread mentioned the MXJO "35A" battery. It's a 20A LG HE2 rewrap. Don't bother getting it.
Here are good batteries. There is
no true 35A CDR battery on the market. Period.
http://www.illumn.com/18650-lg-icr18650he2-2500mah-high-discharge-flat-top.html
http://www.illumn.com/18650-lg-18650he4-2500mah-high-discharge-flat-top.html
http://www.illumn.com/18650-samsung-inr18650-25r-r5-2500mah-green-high-discharge-flat-top.html (same as the light blue Samsung 25R's)
http://www.illumn.com/18650-sony-us18650vtc4-2100mah-high-discharge-flat-top.html
http://www.illumn.com/18650-sony-us18650vtc5-2600mah-high-discharge-flat-top.html (not 30A despite being often mislabeled as such)
And just to explain why (for a pre-built coil) you might want to go to regulated. With an unregulated mod, you're at the mercy of your battery. You'll never be able to fire more than your battery's nominal voltage (at max is 4.2, but fires at closer to 4.15). If you throw your tank on a regulated mod and find that you like it at 5V, that's too bad, you'll never get that 5V out of your 18650 battery in a mech mod. Additionally, with a regulated mod, the vape will be more consistent (which matters more for a tank than an RDA in my opinion) because the mod will step up/down to your set voltage, rather than you being at the mercy of your battery's nominal voltage.