Comprehensive test of dynohub USB chargers

The Fahrradzukunft magazine published a highly interesting review about dynohub chargers conducted by dynohub manufacturer Schmidt and others. The article was published in German language and unfortunately does not cover my Jawetec charger due to its unavailability. However, there are several interesting devices including the pedalpower+ stuff (check my link bar for more information on it!).
Update: the Fahrradzukunft magazine recently published part II of the USB charger article with some more very interesting devices and updates.

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