"old fart" learning new things in here. I had my new bike for my trainer few days ago and today I was dare to approaching that bike with respect for a closer look. For a moment I was panicking how I charge the Di2 battery. I was checking seat post and handlebar but couldn't find charging port. So back to next to my computer and reading owners manual. After a moment I find it, okay it's in a rear derailleur. After that I was wondering where is battery charger, I have a gable but where is charger (bit of panicking again), back to computer. Okay, power supply with usb-port or computer will do that. Exciting moment to get to know new things.