These are batteries from personal vaporizers that have removable batteries. These sizes include 18350, 18490, 18650, and 26650 batteries. Be sure when you are using a removable battery and mod you are adhering to battery safety to provide a desirable vaping experience for you and the lithium ion battery.
Thevaporium.com will not be held responsible for any misuse of above battery. If you have any questions about safe vaping on these batteries please contact us. We do not recommend using contact spacers, magnets, any odd modifications, or extremely low ohm builds.