Allowing IC planes to be weighed without fuel yet stipulating under the same set of rules that electric planes must be weighed with batteries is unfair and bias against electric.
Maybe, but IC planes have always been weighed with the batteries in. I ask why should an electric plane be exempt from this?
Just because it's for the motor and not the radio gear is a hollow argument under the current rules.
However, given it's the 21st century and we are bound to see further innovation, it sort of makes sense to dispense with the fuel/batteries in/out debate and push for a unified maximum takeoff weight. Consider placing rules limiting propellor total blade area, diameter, pitch (or all three) should take care of any HP wars no matter the power source.