If the gradient is steep enough then you would not be recouping most of the energy going back downhill because your brakes will be burning off the energy. Uphill and downhills is a combination where the estimated range might be thrown off entirely, depending on situation.
Regardless, even with a small gradient, the kinetic energy can never need 100% converted back into stored energy into the battery. There will always be a loss.
Regardless, even with a small gradient, the kinetic energy can never need 100% converted back into stored energy into the battery. There will always be a loss.