I just ran across this post while searching on this topic. Because of historical problems with battery life on other devices, I have been tracking the number of hours I get out of the eTap batteries. I’ve had the system for 5 months and, including the travel time, I am getting 20-25 hours before the red lights come on (typically 10-12 hours of ride time and a similar amout of time with the bike in a moving car) I’ll admit I do shift a lot but that stiiil seems to be well short of the claimed battery life. Anyone else experiencing short battery life?