Have you gotten the first Eleaf iStick product: iStick 20W? It must be a fantastic vaping experience you can enjoy. From this stuff, you can obtain a long-time battery capacity supply and stable power output. However, a feature you can not enjoy on this stuff as on iStick 100W is the changeable cell structure, that means you can replace the built-in battery with a spare cell. If you would like to give this unique feature a try, suggest trying iStick 100W and if the temperature control function is another consideration, you can give iStick TC100W a try, this fantastic battery is also firmware upgradable. Two replaceable cells are available for you. You can use one cell on it, then the output power can be 75W and can be 100W when two cells are installed.