lasersaber | Fully Levitating Magnetic EZ-Spin Motor - Pyrolytic Graphite @lasersaber | Uploaded March 2019 | Updated October 2024, 8 hours ago.
The motor has started. I may not live long enough to find out how long it will run. :-)
Low RPM mode:
Current draw: 150nA
Voltage: 33mV
Wattage: 0.00495µW
3900000μWh ÷ 0.00495µW = 787878787.8787879hrs
89,880.785583 years on 3.9Wh!

Standard AA battery: en.wikipedia.org/wiki/AA_battery
3.90 Wh
3900000μWh Microwatt Hour

Pyrolytic Graphite: kjmagnetics.com/products.asp?cat=85

40 year battery: tadiranbat.com/is-a-40-year-battery-life-a-reality.html
digikey.com/product-detail/en/tadiran-batteries/TL-4902-P/439-1060-ND/1949333

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Other Projects: laserhacker.com