Hello, I am modeling a drone and for accurate modeling I want to add mass and inertia property which is not a link For example, Battery is just a mass chunk which is shipped in battery mount, so I think modeling as a link is improper. Because If I modeling it as a link, it should be modeled as a connected thing to base link but battery is not connected but separated. If it is point mass, modeling as a link is actually impossible

Is there any way to modeling mass (or point mass) not using link?

Thank you