WARNING: Efest Purple 35A 3000mAh is now a 10A battery!
Mooch is a pretty well respected battery tester around here and the main issue with Efest is that they overstate the discharge abilities of their batteries. i daresay it's a passable 20A battery, although most of us will use either AW's or the brown HG2's.
It really all depends on the coils you build, because Ohms law is such that the lower the resistance of your coil, the more you ask of your battery. My coils measure 0.3Ω, so assuming a (worst case scenario) battery charged to 4.2v - i'm asking for [I=V/R, = 4.2/0.3] 14Amps from say a 20A
constant discharge battery, which is fairly safe.
You are always after the CDR or the constant discharge rating of a battery. Pulse ratings are a spurious irrelevance and there is no such thing and no industry standards for such a measurement.
T