NOTE: I state in the Conclusion that it took a 1/2 to charge a battery from 77% to 99%. It actually took THREE hours. About a year ago, I came across this 20W Portable Solar Panel from Ecosonique Technologies during Amazon Prime Days. After waiting a year, I thought it was time to do a review and do some testing. I also wanted to throw this on my backpack and simulate a 1/2 hike with it to see how well it would charge. How viable is a small, 20W solar panel. After testing, I think I know some use cases where this would be useful, but there are many where it doesn't work as well as I thought it would. Not Sponsored Links: Please note the Model #E20 is no longer available, but there are alternative. Amazon US: https://a.co/d/94kh8Te Table of Contents: 00:00 - Introduction 01:00 - Unboxing 03:00 - User Manual 04:00 - Look at the Solar Panel 05:48 - Testing Outdoors 07:55 - Backpacking with the Solar Panel 10:21 - Final thoughts and conclusion