Shimano di2 battery status11/2/2022 The red and green lights coming on solid momentarily and then turning off, as happened to you following the green battery indicator light alone after holding down a shift button, indicates you are in shift mode M, for manual. And you can then cycle through those three modes again and again. Finally, the third time that you push the mode button twice, you will be back where you started the red and green lights will once again come on solid momentarily, and then turn off. And if you again push the mode button twice, the red and green lights will flash three times. I am sure you will find that if you push the mode button twice on the bottom of your Junction A, the red and green lights will flash twice. Since I am assuming from your set of statements that you had not had this occurrence before, you are now the owner of a bicycle set up for Synchro Shift, Shimano’s coordinated front/rear shifting system that was pioneered on mountain bike Di2 systems and is now on road Di2. #Shimano di2 battery status manualWhat you are looking at on those LEDs on your Junction A is, first, the indicator of battery charge level (the green light alone, meaning your battery was fully charged), followed by the indicator that you were in Manual shift mode (the solid green and red lights together). There was no need to get a new battery yours appears to have been working perfectly. #Shimano di2 battery status updateIt sounds to me like you got a Di2 firmware update when you took your bike in for a tuneup. I purchased a new Di2 battery, installed it, plugged it into my laptop, and charged it when I tested it, the same issue happened: the green light came on first, followed by the red light. At home I plugged it in and charged it, and when I held down the left shifter, the green light came on, followed by the red light. A week later when I picked up my bike, I noticed the Di2 battery was completely dead. Recently I took my bike in for a tuneup and a new cassette and chain. I was watching one of your YouTube videos and I have a question. Don't miss a moment from Paris-Roubaix and Unbound Gravel, to the Giro d’Italia, Tour de France, Vuelta a España, and everything in between when you
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