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I had this problem. A temporary cure was replacing the battery connector. It worked for 17 rides and then began again. Next, I broke the electronic shift cable so the tech at BWOL went in and rewired the whole system and even removed the motor temporarily. I have gone through 30+ rides and...

I am having the e10/e20 failure as well. I replaced the battery and that lasted for a few rides and then the motor cut out again. Next, Shimano sent new battery electronics and that lasted for 17 rides. I thought it was fixed. Now, it has failed 3 out of the last 8 rides. Yesterday, it...