It operates at 1.7A and 2.6V, and I can't find a 2.6V alimentation/battery so I wondered if I could use a 9V battery, also I use a A4988 Stepper Motor Driver, which operates on the motor, and I may have read that this Driver cuts the voltage, but how does it work (if it works) ? and is it achievable to send 2.6V 1.7A easily without convertor ?
Modern steppers like yours use a current controlling driver so the supply voltage is not relevant as long as it is high enough for the chosen driver. For instance, I would use a DRV8825 driver for that stepper motor. The DRV8825 requires at least 8.2V motor supply voltage. Speed and torque will increase with increased motor supply voltage up to the maximum allowed by the stepper driver (45V).
Popular supply voltages for those motors/driver combinations is 12V or 24V. Those supplies are plentiful and inexpensive since the advent of 3D printers.
If you are considering the DV8825 (or any driver) please read the instructions carefully. The coil current limit must be properly set before using the motor.
Thank you for your answer, I already have the A4988 Stepper motor driver, so I believe it will do the job, is that correct ? I will set the coil current limit before using the motor