TrendBox Pack of 10pcs 3x18650 11.1V Black Plastic Battery Storage Case Holder Clip Type with 6" Two Wire Spring Lead Flat Tip Li-ion Battery DIY

A while ago. I realized that I got quite a few solar panels laying around that are not being used for anything Due to the nature of solar panels, it is obviously not possible though To directly connect them to projects and thus use them as power sources They're constantly altering output voltage and current due to different solar radiations is the reason for that But feel free to watch my basics video about solar panels to better understand their working behaviour The solution to this problem would be a circuit that uses a solar panel to charge up a Lipo or Lithium-Ion battery Which we can then use as a power source for our projects But that such a circuit actually exists was my initial question While searching for it on eBay and the answer is yes such a circuit does apparently exist The only problem is that after I did a couple of tests with its I realized that it is not perfect for my