QUESTION: I’ve got a bike with ultegra di2 electronic shifting after 2 years and 10k miles With no problems. The system won’t stay charged more then 48 hrs. The Bike has spent most of the summer in the local bike store where they swapped the main cable And the battery. It still Doesn’t work. Any suggestions? As a work around I just charge it up before every ride when charge … [Read more...] about Di2 Batteries Won’t Stay Charged: Ask the Coach