I have to express my satisfaction concerning this matter. I do use my Fairphone 2 with the bike Navi Kompott and what really surprises me each time: the Accu loads up to 100% while biking and using the Navi. It loads via the bikes hub dynamo and komoot is configured to turn the screen only on when the direction changes I e. along with a voice instruction. Compared to my former Smartphone Fairphone 2 energy management seems to be phantastic. I no longer do need a Powerbank or recharge during a bike break.
Which is it?
(I only want to make sure this really is about the Fairphone 2, as its battery is on the weaker side of things.)