Researchers unveiled prototypes of quantum batteries that could power smartphones for an entire week on a single charge, marking a potential leap beyond current lithium-ion technology.

The prototypes, developed by a consortium of European universities, rely on qubits to store energy more efficiently and charge in seconds. Early laboratory tests suggest the batteries could hold exponentially more power than existing cells while occupying similar space inside devices.

Analysts caution that quantum batteries remain years away from commercial use, citing stability challenges and high production costs. Nonetheless, major tech firms are already investing in research partnerships, hoping to capitalize on a future where mobile devices rarely need plugging in.