The One UI 9 update for Galaxy S24/S25 is causing rapid battery drain and overheating due to a regression in the "pm-daemon" that misclassifies background tasks as high priority. This keeps the CPU in a constant "performance" governor state, increasing active time, temperature, and significantly reducing battery life. Mitigation tactics include disabling Adaptive Battery, forcing the "powersave" governor, restricting background sync for Samsung apps, and enabling "Don't keep activities" in developer options. A rollback to One UI 8.5 is also an option.
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