Originally Posted by Moe Zhoost

Wattage is just the product of voltage and amperage. Voltage is normally fixed by the number of cells and amperage can be programmed up or down within limits. If claiming a wattage specification, the vendor should use the nominal battery voltage. Are you saying that RadPower is using the fully charged voltage instead (e.g.. 50+ for a 48v battery)?

More likely they are either using a higher voltage battery for a particular motor (e.g. 48 v instead of 36v) or have programmed a higher amp limit. Either of these methods can work to achieve their wattage claim. It is common that bikes are tuned by such adjustments to meet certain regulations.