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I'm not sure they did.
"Shimano electronic gears could soon charge themselves"
"How likely is this to make production?
I’m in two minds here. On the one hand, Di2 batteries work for so many shifts already that the need for this system isn’t totally clear."https://www.bikeradar.com/features/shimano-electronic-gears-could-soon-charge-themselves/
hippy
I'm still waiting for the jockey wheel dynamos that will recharge my Di2 system which Bikeradar breathlessly speculated were going to hit the shops imminently a few years ago based on a Shimano patent.