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Not solar, not batteryless, yet relevant:
https://newatlas.com/enomad-estream-portable-water-turbine-charger/44897/
I’ve seen some of these that do not have batteries — just a turbine in the water generating electricity directly to USB device.
newatlas.com
Portable turbine provides a "stream" of power for charging devices
Portable solar chargers are perhaps the most popular means of keeping devices powered in the wilderness and, as we've seen, portable wind turbines are an option too. To cover all bases though, you may soon also be able to take … Continue reading