IMHO, the best 18350 battery on the market are the AW IMR 18350. 800 mah capacity with 12 amps CDR. Theoretically you could build down to around 0.5 ohm with this battery and still have a little safe headroom. At that resistance, battery life will suck though.
1.0 ohm = 4.2 amp draw
0.9 ohm = 4.6 amp draw
0.8 ohm = 5.2 amp draw
0.7 ohms = 6 amp draw
0.6 ohms = 7 amp draw
0.5 ohms = 8.4 amp draw
0.4 ohms = 10.5 amp draw
0.3 ohms = 14.0 amp draw
0.2 ohms = 21.0 amp draw
0.1 ohms = 42.0 amp draw
0.0 ohms = dead short = battery goes into thermal runaway