Make a crystal cell battery.
Get 1 rod of solid magnesium about 1" in diameter and 1 to 1.5" long. (Check Amazon, Ebay, or your favorite site for odd stuff. I think an electric hot…
Chinese 18650 batteries tested and compared.
Project Farm on Youtube compares cheap Chinese 18650 batteries with quality 18650 batteries in this review. https://www.youtube.com/watch?v=qMZuHMlRw_0
AA battery test from Project Farm
Project Farm is a Youtube Channel and does a lot of comparisons of a lot of products. This video is a test of AA batteries of many brands. It turns…