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Testing, testing, 1-2-3. I had been riding a bike with Shimano Dura Ace 7970 Di2 shifting powered off the generator hub for 12 years. I recently sold that bike but plan on going back to it someday because it was fantastic. By the end of that time though, the battery part of the system had totally given up the ghost. It couldn’t hold a charge at all and I quickly realized it was not necessary (aside from working on the bike in the stand). I unplugged it and I was running it exclusively off the ge

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