Cool footage, from China, of a product developer showcasing a vacuum flask which can be turned into a power bank for a smartphone when hot liquid is poured inside.

The video, captured in Beijing on October 25, shows the woman inserting a charger cable into the bottle and connecting to her smartphone.

Then, she pours hot water into the cup and the phone starts charging.

The 28-year-old inventor developed it for travellers to charge their phones on their journey.

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