Remove most of the batteries to reduce the weight? Trading flight time obviously. Of course since Martian gravity is only ~.4G, you'd have to remove a lot of weight, so a lot of batteries. On a device that's already been designed to be as light as possible.
Unfortunately, changing weight of the helicopter changes also changes inertia and the moment of inertia [1]. On mars, only the gravitational force changes, while inertia stays the same.
That will be somewhat more tricky (or impossible) to emulate on earth.
