SMOK V8 Baby Q2 Coils 0.4 Ohm replacement coils for the SMOK TFV8 Baby Tank and SMOK TFV8 Big Baby Tank. The SMOK V8 Baby Q2 Coils are dual core. Power range for the Q2 0.4 Ohm is 40 to 80 Watts with optimal performance at 55 to 65 Watts.