Hello, everybody. As more and more manufactures released 21700 battery recentlly. Vapesourcing has promote Eleaf pico 21700 Kit And Wismec Reuleaux RX2 21700 kit. Pico 21700 kit is compatible with 21700 battery as well as 18650 battery and provides a high drain Avatar AVB 21700 battery for your option. It is capable of running up to 100W and has a maximum of 2A charging for efficient recharging. Reuleaux RX2 21700 kit is compatible with 21700 battery as well as 18650 battery too. It is equipped with dual optional high performance 21700 batteries, capable of firing up to 230W with 2A quick charge system. Now we share it Giveaway! Rules: 1. Do you think 21700 battery will replace 18650 battery? 2. What is your favorite product from our website (Vapesourcing.com). 3. Do you like pico 21700 kit or RX2 21700 kit? Please state your reason. Every participants has up to three times to enter. Please comment each request separately . Waiting for your comments and wish you have good luck! We will choose two winners to get Eleaf pico 21700 kit or RX2 21700 kit in random. Winner will be announced on Jan, 17th. PS: There is no battery cell in the package as it's prohibited with air shipping.