At Evolution Vapes we stock any batteries you may need for your use cases. From the chunky 18650 and 21700 External Batteries. To the all in one internal batteries like the EGO II for example. All Batteries are shipped safely from store to you if you purchase online, or can be bought in person. However please note, the external 18650 and 21700 batteries will require an external charger, which we also sell here at Evolution Vapes.