A battery pack is an ancient idea updated with modern technology: a storage cell for energy that allows starships to extend their ability to hyperjump, cheap (10,000 cr) and available almost anywhere. The basic system has hardly changed in over two millennia of space flight. One battery pack stores enough energy for one additional jump, and up to four may be fitted onto any ship providing it has enough free mass space. Each pack weighs three tons. Battery packs may be purchased at virtually any outfitter in the galaxy.