I'm currently doing a mini project as an assignment in my engineering course. I tried replicating the coin battery, where I stack a piece of cardboard soaked in black vinegar (couldn't find white vinegar), a piece of aluminium foil, then a 20 sen
coin (Malaysian, cupronickel), and continue. I managed to get a stable reading of 6V. However, my 5mm LED did not light up when I tried connecting it. So, I tested the coin battery using the link multimeter and found out that it only produced 23microA. How do I increase the current? Or is that not the problem?