How to infer battery consumption on a non owned app

I am a back-office system developer, and am struggling to deal with a problem. I am addicted to podcasts (in fact I use the Podcast Addict app ), but I am interested in all kinds of subjects and there are a lot of podcasters to provide me a bunch of options. This addiction means that I have more podcasts to listen to than hours in a week. So I listen with accelerated audio. **But**, podcast addicted implementation of accelerated audio is very power hungry, and I am wondering if it should. My goal is to get any information about CPU/GPU usage of every podcast player when playing in accelerated playback. Any advice? Tools? Procedures? Anyone has made this analysis before?