The SoFlow SO ONE Lite should reach 20-22 km/h in sport mode. A top speed of only 13 km/h is unusual. Possible causes are a low battery level, low temperatures, incorrect riding mode, low tyre pressure, a speed limit set in the app or a firmware error.
To rectify the problem, the battery should be fully charged, the driving mode checked and changed if necessary, the device restarted and the app and firmware updated. If the speed remains limited, we recommend sending the device in for inspection or contacting the manufacturer's technical support team first:
http://soflow.com/support....