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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.
grams
Brommers
Had an idea and wondered if anyone has done/seen similar - I want to mount my di2 battery in the fork steerer and use it as a cache battery to power a phone/GPS while riding, as well as shift gears... I also hope I can charge it on the go with a dynamo front wheel... and it would be cool to power a front and rear light as well...
that sound doable?
Cheers in advance!