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by ehnto 1473 days ago
I have a 1200mWh bike light that lets you charge stuff off it's battery, it's a life saver. I have used it to charge my phone and my rear lights in a pinch.

I am just remembering now that my e-bike has a USB port for charging off the battery too. I don't ride it much so I haven't used it yet, but I assume I could charge just about anything to full capacity off it.