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Brommers
The Di2 battery is tiny (in mAh) so useless for any serious lights, and there's scarcely any benefit of charging it continuously, since it only needs topping up every couple of months, and you can do that off the dynamo without hard wiring if you really need to.
I could kind of understand having a centralised larger battery to run all electronics off, but I wouldn't want my gears to be dependent on janky homemade electronics, so that's where my enthusiasm for the idea runs out.