I was debating on WS or SS. I decided WS because the wind conditions were in that favor. The legs felt good to start. Making it to the end of OTR in good time. The way out to WS was the usual grind into the wind. When I got to the summit of Highline, I was ready to go downhill. I tried shifting into my big ring, and the Di2 did not respond. So, I pulled over to diagnose the problem. I found out that the battery was near depleted. It was in "conservation" mode. So, I had to decide. Turn around or continue. The rear derailleur was shifting fine. So, I decided to keep going. As long as I could shift the rear gears, I would be ok. Fortunately, the I was in the little ring, up front. I made my way to WS and headed back. I had a gear big enough to maintain up to 27 MPH. When I made it back to the summit of Highline, I was having to coast. Reaching near 40 MPH. From there, I made it to OTR. Mostly fun and games from there. Concentration was good. The morale felt good. I had lots to think about. Ailments, next to none. Balance and form was good. Gear worked great, despite the depleted Di2 battery. I adjusted my right cleat to a narrower stance. I think it felt better. Perhaps I need to adjust the left cleat to match the difference. Nutrition was good. I had enough Gatorade. I don't think I drank any water, but if I did, it was only a few sips. Other notes, I saw a glider being towed, near WS. I saw a very beautiful bird, white, with a long neck. I tried to take a photo of it, but if flew away before I got my smartphone out of my pocket. I saw 2 cyclists today, one casual, the other my equal or better.