Samsung's One UI 9, built on Android 17, is degrading battery life on Galaxy S24 and S25 devices after installation, according to user reports collected by 9to5Google.
The pattern matters because One UI 9 is a major OS update, not a minor patch. When a flagship software release consistently shortens battery life across two hardware generations, it signals either a background process regression, aggressive new telemetry, or a power management conflict introduced at the Android 17 layer. The original piece documents specific user complaints worth examining if you own either device.
Samsung has not issued a fix. If you are on affected hardware and have not yet updated, this report gives you reason to wait. If you have already updated, the user data in the full article may help you identify whether your drain pattern matches the broader issue or something device-specific.
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