This transparent lithium-ion battery charges itself using sunlight - no solar cell required

Japanese Researchers have invented an amazing lithium-ion battery that can charge itself using sunlight without any solar cell.

The working prototype was demonstrated at the Innovation Japan 2015 trade show last month in Tokyo, and the team behind it hopes to see the technology integrated into a 'smart window' that can act as both a large rechargeable battery and a photovoltaic cell all at once.

Source: Sciencealert