Complex sentence: Ultracaps or Supercaps may be used in future to have higher electric currents when loading (regenerating) or accelerating without damaging the batteries but only store energy for short durations (-30s).
Split into simpler sentences: Ultracaps or Supercaps may be used in future to allow higher electric currents when loading (regenerating) or accelerating without damaging the batteries. These only store energy for short durations (-30s).