The WISMEC Reuleaux RX300 TC eXpress Kit with 300 watts for FOUR 18650 batteries. With the Releaux RX300 WISMEC creates new dimensions. The RX300 draws its power of 300 watts from four 18650 rechargeable batteries (not included). The used batteries should have at least 25A. Please use unprotected batteries and ALWAYS use batteries of the same type. With the QC (Quick Charge) USB cable it is possible to charge the batteries in the device itself. With up to 1.5 A, the batteries are charged. Nevertheless, we recommend to use a suitable charger.