Hi Rudi, Tokymaker can work with a maximum of 6 Volts. That is:
- 4x AA alcaline 1.5V Batteries
- 5x AA Rechargeable 1.2V Batteries
- 5V USB Charger
- 5V Rechargeable Batteries
Also, if you are using the Competition Robot Motor Extension, you can use Li-Po 2S 7.4 Volts and 3S 12 Volts Batteries. Those are the same used for drones ;)