The human heart is in a great physical location for a natural organ. It's well protected and physically close to lungs and brain. For an artificial organ, not so much: Placement inside the human body causes an enormous amount of trouble from energy to organ rejection.
Now lab-grown blood vessels are
available and they don't cause significant troubles. I don't know if they're sturdy enough for this, it's possible that plastic ones would be needed.
I propose extending veins and arteries from where the heart is supposed to be to just under a patient's back. A stiff, non-bio-active plate would be placed on the opposite side. Skin would be grown over this. It would look like this:
A machine would massage the blood vessels through the skin* with rollers to move blood around the body. It would be worn as a backpack tightly and securely strapped to the patient.
This would allow the whole physical apparatus to be outside the body for easy servicing, easy recharging, larger batteries, a way to directly move blood by hand in emergencies, and much less likely rejection.
*You'll have to grow thick skin there to prevent sores, pain, and other skin problems from the constant movement. maybe like feet have?