Experts have come up with a cellphone that can recharge its own battery by harvesting energy from the owner’s motion.

The self-charging handset by Nokia, who has already filed for a US patent, was predicted to work with heavier components, such as the radio transmitter circuit and battery, supported on a sturdy frame.

The frame apparently could shift along two sets of rails, allowing it travel up and down and side to side, New Scientist reported.

Each rail apparently hosted strips of piezoelectric crystals at its end, capable of generating a current when compressed by the frame such that motion, by the user or the movement of the phone, generates electricity.

That in turn charged a capacitor and subsequently the battery, boosting the charge.

Nokia, Self-Charging Cellphone