Am am going to guess you plan on using just one battery at a time. That should be safe if they are the efest hybrids. Those are rated 10A
Specifications:
Nominal voltage 3.7V
High current rated
Lowest permitted discharge voltage - 2.5 V
Cycle life - 500 cycles
Max charging rate - 2.15 Amps
Max discharge (10A)
Do not short circuit - High current will be discharged
Diameter: 18.0 +/- 0.5mm
Height: 66 +/- 0.5mm
If you are fully charged at 4.2V you will be hitting 23Watts and 5.5Amps. The
batteries may get warm. If you have your heart set on sub-Ohming you should invest in some higher drain batteries though. Something in the 20-30Amp range.