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@aserota
You're not missing anything. I used to find on my motorbike that a USB charging slot was so handy when riding - i.e. using a car satnav or charging a phone. I wanted to have the same option on a roadbike, but without the use of a dynamo. Just thinking about all those people running Di2 and EPS with a battery converted to run inside the post - so thought it may be nice have a port on the post for a rear light to charge if it dies on a commuting trip or just to juice something up when moving.
Not really a business idea, otherwise it would be dynamo related - just a slimline or rather bike fitting inside rechargeable power pack