akb825

Poweramp was in the background with the screen off.

I still have the battery drain after installing this APK. I guess that rules out Google services being the culprit.

Keep notification and keep service are both off. I use wired headphones.

That's average usage over the last week. The current usage (on the top of the screenshot) is 4.2%, which according to his post was over the course of 20 minutes. That sounds like an incredible amount if drain.

Screen was off and any playback control was done with an inline remote.

@maxmp it didn't take long for the battery drain to happen, even after disabling Chromecast support and restarting my phone. I have attached a screenshot of the battery usage over a ~2.5 hour period after updating back to the latest version. After restarting my phone it was at about 95% battery remaining. I listened to music for ~30 minutes after rebooting, which you can see with the first slight drop in battery. I believe the drain was more or less normal during this period. I think didn't listen to music for a while, which you can see with the flat line where there was next to no battery usage. Afterward I listened to music for another 40 or so minutes as I finished up at work, then another 20 minutes on my drive home. (it was playing through an aux cable in the car) During this time the battery drained very fast, as the graph shows, and the phone was hot. After getting home, I went for a 30 minute walk, during which I did not listen to music or use my phone at all. (apart from a couple glances to see the state of the battery) The phone was still hot at first, though it did eventually cool down. While the battery usage was less than the massive drain earlier, it continued to drain batter even when not otherwise in use, as compared to the flat line earlier when it had entered deep sleep. Based on the slope of the graph, the drain when not in use during my walk was even greater than the normal drain when it had normal drain during playback earlier. While the battery usage shows 11% for Poweramp and 1% from Google Play services, since it started at about 95% the total drain was closer to 20%. For reference, during a typical day it will start at 100% in the morning, and between listening to music throughout the day (maybe ~6 hours total playtime) and other light usage I will be ~80% remaining when I get home without any charging in-between. Based on this, I think we can rule out the Chromecast integration as the culprit. I do not see constant progress bars in the library, and my library is on internal storage (I don't even have an SD card slot on my phone), so I don't think re-scanning is the problem either.

@maxmp my point is that you might get different results with real-world usage where you interact with the app compared to just letting it play untouched overnight. I definitely had much, much higher drain than normal, with the phone getting hot. I had previously downgraded to 820 to avoid the problem, but I installed 823 again, disabled the Chromecast button in the UI settings, restarted my phone, and will report back if that has any impact.

What do you do to try and reproduce the issue? For example, do you just start a playlist and have it continue playing overnight? Do you try to follow common usage patterns for real-world usage of the app? For my own usage, during most of the time the screen is off, and I'll use the inline remote on my wired headphones to control playback. Occasionally I'll do other things like browse the internet on my phone while it's playing, and I'll sometimes use the interface in Poweramp rather than the remote to switch songs. I also make use of the feature to stop playing when the headphones are unplugged. Another user mentioned bluetooth being a possible cause, and while I have bluetooth enabled I don't use it to play music.

18% total cpu usage likely means 1 core at 100%. While under normal circumstances cpu usage is low, most likely something is causing high cpu usage when draining the battery. I know the phone gets hot when I experience it, and the battery info shows Poweramp as the cause.

I see the same problem on my OnePlus 6 with Android 9. I have 18 GB of music on internal storage, and after installing the latest update it's eaten through battery several times faster than before. (for example, I would typically have > 70% of my battery remaining after listening to music at work, and yesterday I had ~30% remaining without any change in behavior) The phone also gets very warm during playback. I'm not aware of any chromecasts on my network, but I am connected to my work network so I wonder if there's some network situations that trigger the problem if it is related to the chromecast feature.