weather looked good and wanted to bike Vashon and Maury Island. Also wanted 60 miles or more plus 5,000' of climbing. Forgot that it was a weekend and my ferry boat schedule was based on weekdays so got to the ferry early, Light traffic on Vashon and time to stop at SnapDragon bakery for breakfast roll and coffee. So good that I ordered one to go for Sunday morning. Lots of relatively steep hills and not exactly sure where I was at when I reached the Light House. Went right to a deadend and then left on a barely there road that was at times single lane. Quick dash then to the south end of Vashon and caught the boat as it was loading. Finished Gig Harbor with the steep hill climb followed by Banner road in Olalla. Data: First time I have used Skip's range extender and it will take some getting use to. Multiple reading of the battery charge to discover that it will cycle from main battery to range extender battery. Discovered that the main battery was 99% and the aux battery was 56% Aux battery was drained on last hill climb on Vashon so running on main battery which read high 80's when the aux battery was 0% But my the time I got to Olalla only had 24% for the Banner climb and the battery quite at 14% on the hill. Had to walk two of the last small hills to get home. Disappointing results as I will have a lot of 60 mile rides with 5,000' elevation on my Calif trip. I have made this almost the same bike ride on Vashon with just my internal battery and made it home OK. Not what I expected.