The Aspire CF Battery series provides a powerful sub ohm electronic cigarette with a inner rechargeable battery rather than removable batteries that are typically seen in e cig’s that are sub ohm compatible. This battery features stainless steel ends, a carbon fiber coated tube, and a large metal fire button. Unique technology that’s featured in this battery is the revolutionary spring connector which ensures a strong connection between the battery and tank. The structural design and control circuit of this Aspire CF Battery is extremely reliable and stable. Battery can be charged with the traditional 510 threaded ego charger.