Joe,
OK, you know Ohm's Law, so you know that with a .8 ohm coil, the most current you could ever draw from a 4.2 volt battery (which is what your batteries would be fresh off the charger) would be 5.25 amps on a mechanical mod - assuming zero voltage drop across your mod. You would also know that 5.25 amps exceeds the max of your SVD. I don't own an SVD so I can't be sure what would happen, but I would guess it would either: a) refuse to fire or b) fire but limit your current to 5 amps.
Getting to your original question:
I have several mechanical mods running 18650 batteries with RDAs. I wrap all of my coils at 1-1.5 ohms, and use cotton wicking. And even though I may not win a contest anytime soon, they produce a very satisfying amount of vapor. So in my case, let's say I'm using a dripper with a 1.2 ohm coil and a freshly charged battery - the most current I could possibly draw would be 3.5 amps, which is well within the safe operating limits of even a standard Efest battery.
The only time you need a high-performance battery would be if you are really pushing the envelope with sub-ohm coils on a mech mod. In fact, there is really no need to use high-performance batteries in a regulated mod - it's a waste of money IMO. Why use a battery rated at 30 amps in a mod that will NEVER pull more than 5 amps? It is completely unnecessary.