@teotwaki Yes and no - it is to store a battery in the wheel, but not for a hub motor. I have a mid-drive motor with a downtube battery.
This is to power lights in the wheels themselves. I want to keep riding to work in the winter but we all know a driver's favorite song about cyclists - "Oh, I didn't see him!"
With three 21700 cells I can get a 12V 5Ah battery. I'm running some tests this week to figure out what kind of LEDs will give the best balance between brightness and longevity.
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