A new type of battery that lasts for days with only a few seconds' charge has been created by researchers at the University of Central Florida. 

The high-powered battery is packed with supercapacitors that can store a large amount of energy. It looks like a thin piece of flexible metal that is about the size of a finger nail and could be used in phones, electric vehicles and wearables, according to the researches. This tiny supercapacitor battery could last for days.

The battery isn't yet ready to be used in consumer devices, the researchers said, but it shows a significant step forward in a tired technology. 

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