Sun-Cat? Weird name, but clever DIY technology. It’s something that no one has ever though off. The idea is to warp a rechargeable batteries with a flexible solar panel like shown in the picture below:
It’s a homemade prototype so you won’t find it elsewhere. Brilliant Idea, I can say. It both save the environment from hazardous liquid and save money on electricity bill. I hope this will become a real stuff, with additional functionality, let’s say a “plug-and-recharge” feature that will compatible with most of the rechargeable battery type.