The CCell M3 is an ultra slim and compact pen battery for all '510' cartridges (Compatible with all BlackGoldVape Cartridges). Made of stainless steel to handle every day carrying in a pocket or bag. The M3 is a buttonless battery that automatically activates only when you inhale. The LED indicator to let you know when it's active. The M3 gets about 150 rips on a full charge of the internal 350 mAh battery and recharges quickly with the included USB '510' charger.