One problem with isotopic storage, which uses the atomic nucleus to store energy, is that it has a natural tendency to lose its charge over time (this is also a problem with more conventional energy storage devices).
The quantum battery takes on the charge leakage problem. By harnessing the power of "excitonic energy" — the state in which a nucleus absorbs charged photons of light, the resulting battery is highly robust to energy losses. The fact that the photon is absorbed in an isolated state where it cannot exchange energy — by absorbing or releasing photons — with its surroundings, prevents charge leakage.
Breaking down this isolate state allows the battery to discharge and release its energy.
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