LZ’s Tech FAQ: Technical FAQ: Using Di2 Synchro Shift – Di2 battery help Dear Lennard, I was watching one of your YouTube videos and I have a question. Recently I took my bike in for a tuneup and a new cassette and chain. A week later when I picked up my bike, I noticed the Di2 battery was completely dead. 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. I purchased a new Di2 battery, ins… http://ow.ly/h4g150bo2Od
