The IQOS 3 MULTI does not require a full charge to work, however we recommend to fully charge the device before the first usage. Full charge of IQOS 3 MULTI takes 75 minutes using the official IQOS AC power adaptor and USB cable. Only charge IQOS 3 MULTI device using supplied AC Power Adaptor and USB type C cable. Usage while charging: If the device is being used and put on charge (connected to an electrical outlet) at the same time, it will NOT charge despite the lights indicating the charging. Additional information: IQOS 3 MULTI USB cable hosts a USB type C port that is different from IQOS 2.4+ Only charge your product by using one of the following approved IQOS AC Power Adaptor models: S52A21, S21A20, S21A22, S21A23, S21A25, S21A27.