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If you still want to charge with your dynamo, be aware charging things like your phone or GPS directly (rather than using the dynamo to charge a power bank then using the power bank to charge your device) may damage them.
Also, it will likely take all day to charge a 10,000 mah power bank from empty (or that might reflect the speed I ride at!). I have tried taking two 10,000 mah power banks and leaving one charging off the dynamo during the day and using the other to charge phone and Wahoo.
Ah, sorry to hear that.
Think they must have been inundated. Having had to pick people to run the London Marathon for a charity I used to work for I don't envy them having to make the decision.
A couple of us have jumped on the reserve list for Sverige Tempot (northern tip of Sweden to the south, 2100km or so- technically a brevet I think?). DIY option of that or GBDuro still on the cards, dependent on all restrictions.
Still going to go ahead and build a bike for these types of events, probably a Mason Bokeh. Interested to hear what the latest take on dynamo vs battery pack is? Currently leaning towards a dynamo setup.