They're terribly expensive for something so simple
https://www.instructables.com/id/10-BICYCLE-USB-CHARGER/
not sure I believe this guy that's definitely not waterproof is it
Haha no of course not. I just mean its a relatively simple circuit in with a bit of plastic or alu for a plug and they're £100+ usually
@platypus started
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They're terribly expensive for something so simple
https://www.instructables.com/id/10-BICYCLE-USB-CHARGER/