Hey all you guys ! This is very important! The only batteries that should be used with any vape device are the extremely high drain current rated ones. ESPECIALLY for low ohms use . 18650 lithium rechargeable rated at 35 ,or at LEAST 20 Amps are probably what you should be using for the Smok T Priv 3 . Especially with the sub ohm coils . Its Dangerous to use batteries that arent high current drain rated , they can explode or catch fire …... Its an awsome mod , but you do need a charger to charge the batteries , I always have 3 extra batteries ready to switch while charging.