In 2022 on LEL, I had a dynamo hub but didn't have dynamo powered lights. I carried two power banks, which I charged from the dynamo via a smaller battery. At controls where I slept I charged my light batteries, my used rear lights (I carried 6), my Garmin, my GoPro, my phone and my headset, all from one of those power banks. Occasionally I needed to charge my Garmin on the road.
In 2023, on PBP, I did have dynamo lights, and it was so much simpler!