Not necessarily. You're confusing the energy per mole with the rate of reaction. If the reaction runs slowly enough, with only an infinitesimal percentage of the atoms fusing per unit time, then you can have useful energy without blowing up your setup.
That said, I'm still waiting for a LENR demonstration of significant duration ( > 24 hours, minimum, week preferable), done at an independent testing facility.
Since your basic high energy on line storage battery/capacitor system holds about 5.5 hours of juice, you really want to run any test with any equipment that looks kind of like those high energy devices for a much longer time than 5.5 hours.