Quantum batteries lose energy due to entropy — the tendency toward disorder. Just as parallel wires pick up interference, the battery's contacts with the environment create leakage channels. The solution: braid the giant atoms, which act as both charger and storage, into a braid. In this intertwined state, the connection points with the waveguide cancel out parasitic waves: the crest of one meets the trough of another, and the leak vanishes. Meanwhile, the useful energy flow zips along at nearly the speed of light, unbothered by interference.
A surprising bonus: by changing the magnetic field, you can turn the battery into a quantum 'diode' that allows energy to flow in only one direction. Although these devices are still beyond the Standard Model of physics, they pave the way for long-lasting energy storage.
Quantum batteries charge faster the larger they are — contrary to common sense.
The idea of lossless batteries recalls the technology from 'Star Trek': energy is transmitted through waveguides over vast distances without leaks.