Originally Posted by
lortman
One additional comment on Di2. A member of our Sunday morning riding group just purchased a new ½ bike with Ultegra Di2 groupset. Last Sunday as we were just about to depart she noticed she forgot her battery. How much of an issue is that?
With a new bike, the Di2 battery is usually mounted inside the seatpost with the wires threaded through the frame. For retrofit to an older bike, the battery is attached the water bottle cage near the bottom bracket. So I don't understand how she can "forget" the battery if it was installed properly. The battery last a long time, possibly a whole year on one charge.