Energy Ultra - Batteries. Intenso Energy Ultra batteries are ideally suited for use in all everyday devices. From children's toys to watches, kitchen scales, remote controls, and computer accessories: Intenso's Energy Ultra batteries guarantee maximum performance and longevity to ensure the best possible benefit for your applications. Whether low power is needed for a long period or high power demands are placed on the battery in the short term, Intenso's Energy Ultra batteries provide optimal usage options for every energy requirement.