The application relates to a radio-frequency assembly removably connectable to a control handle (4400) of a cordless cautery and cutting surgical device, the assembly comprising a radio-frequency signal generating assembly including radio-frequency-signal-generating circuitry, a voltage-control circuit and an external output, the radio-frequency-signal-generating circuitry having a circuitry output, the voltage-control circuit configured to control the circuitry output and an interchangeable circuit casing (4406) shaped to be removably connected to the control handle, the interchangeable circuit casing configured to house the radio-frequency signal generating assembly and including a securing connection adapted to couple the external output to leads of the control handle, the external output being operable to impart radio-frequency signals to the control handle when the securing connection connects the external output to the leads of the control handle. The application further relates to a cordless surgical device for cautery and cutting for use with the radio-frequency assembly.
