The 18650 Panasonic NCR18650B 3400mah battery is awesome if you don't sub ohm. At only 6.8 amps of continuous charge they are better off being used in a variable voltage mod that does not go over 15w. However as long as your intentions are not to sub ohm these are some really damn good batteries with 3400mah of life in them!

Capacity (Ah): 3.4 Ah ( 3400mAh)
Charging Voltage (V): 4.2 V
Energy (Wh): 12.2 Wh
Energy Density (Wh/L): 730 Wh/L
Nominal Voltage (V): 3.6V-3.7V
Weight (g): 46 g
Diameter (mm): 18.06 mm (+/- 0.03 mm)
Height (mm): 65 mm (+/- 0.03 mm)
Max. Discharge rate: C Raing 2C (Maximum recommended current 6.8A)
Pulse current (5-6 sec.): 12A
Top (positive side): Flat top
Model: NCR18650B