A Capacitor Can Battery Cell
Cell was charged for 20 seconds at 2V 100mA.
It's still running a couple of hours later and will be sitting on a windowsill from tomorrow. The idea is for a very simple 24/7 runner.
My new book, released this week on Amazon -
Fixing Time
Available at: https://www.amazon.com/dp/B07YQCZ162
$2.99
Proper printed version also available!