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PIECE BATTERY is a concept battery which absorbs heat energy and converts it into electric energy.It can be sticked on heat source by magnetism.When it is fully charged,it can be used as a wireless battery for your moblie device by sticking on its back.
PIECE BATTERY is a recyclable battery which spreads the concept of discovering the waste heat energy in your daliy life.As it is thin and light,it can be a convenient energy supplement for mobile devices.