I just got the Range Extender for my Turbo Levo 4 Comp, and I find the manual missing info about setting up how the power is used from the main battery and Range Extender. It appears that there isn't any adjustment, but I thought there was one. The manual suggests that everything is done through the bike display or the app, but I find nothing in either. I would appreciate others' general experience and tips for using it well! Thanks