Not a watt in sight. What magnitude of energy per cubic volume are they dealing with? Energy per weight? Most articles like this make moderately vacuous claims

Not a watt in sight. What magnitude of energy per cubic volume are they dealing with? Energy per weight? Most articles like this make moderately vacuous claims about applications like powering a chip that cures a disease. I complain about that, but then to not have any inkling of practical implications and no link to articles??