Did you notice much of an increase in power use? I've played around a bit with Komoot and felt like it drained the battery really fast.
I used to ride MTB for 3H. If you do not use the screen, only audio Turn by turn guidance, it should take around 30-40% of your battery. With the screen On for each indication, it can take 50-70% for 3 to 4h ride.
But it's true, I've seen an increase in power use from last year, when an update of the app forbid the use of “energy economy mode” of my Samsung S7.