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To make your Galaxy Watch 8 Classic last longer between charges, start by turning off Always On Display, reducing brightness, and shortening screen timeout. If you still need more runtime, adjust automatic health readings or disable connections you do not need. Use Power saving when you can accept reduced functionality; use Watch only mode only when you need the time.
What battery life should you expect?
Samsung lists a 445 mAh battery for the Galaxy Watch8 Classic and estimates up to 30 hours of use with Always On Display (AOD) enabled. Samsung says actual battery life varies with use, so 30 hours is not a guarantee. The figure is a manufacturer estimate, not an independent test. Samsung’s Galaxy Watch8 Classic product page
The Classic is the 46 mm model in the Watch8 series, which launched with Wear OS 6 and One UI 8 Watch. Features and specifications can vary by market, model, or paired phone. Samsung’s Watch8 series announcement
Which settings should you change first?
Turn off Always On Display
Go to Settings > Display > Always on Display and switch AOD off. You will lose the continuously visible watch face, but can wake the display with a gesture instead. Samsung documents this setting but does not quantify how many extra hours switching it off will provide. Samsung Galaxy Watch8 and Watch8 Classic User Guide
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Reduce brightness and screen timeout
In Settings > Display, lower brightness to a level you can comfortably read. Then open Settings > Display > Screen timeout and choose a shorter duration so the display does not stay lit longer than necessary. Adaptive brightness is also adjustable under Display. Samsung does not publish a battery-savings figure for these changes. Samsung Galaxy Watch8 and Watch8 Classic User Guide
Choose a wake gesture instead of AOD
If you want to check the time without keeping the face continuously visible, use a wake option such as raise wrist, touch screen, or rotating the bezel. The best choice depends on how you wear and use the watch; no individual gesture has a published runtime gain. Samsung Galaxy Watch8 and Watch8 Classic User Guide
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What if you need still more runtime?
Reduce automatic health measurements only if you can give up data
The Watch8 guide lets you adjust heart-rate measurement frequency and stress measurement timing. Less frequent automatic readings may reduce tracking coverage, but Samsung does not quantify their effect on battery life. Make changes only if the resulting gaps in health data are acceptable. Samsung Galaxy Watch8 and Watch8 Classic User Guide
Turn off connections you are not using
The Classic supports LTE, Bluetooth, Wi-Fi, and dual-frequency GPS. Disable a connection only when its function is unnecessary: doing so can affect calls, messages, location, syncing, or other connected services. Power saving turns off Wi-Fi and mobile networks when applicable. Samsung does not give a fixed runtime gain for switching off any connection. Samsung’s Watch8 series announcement Samsung Galaxy Watch8 and Watch8 Classic User Guide
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When should you use Power saving or Watch only?
Power saving: conserve battery while retaining basic functions
Go to Settings > Device care > Battery > Power saving. Samsung says this mode uses a grayscale Home screen, limits performance, turns off functions other than calls, messages, and notifications, and turns off Wi-Fi and mobile networks when applicable. Some functions may therefore be unavailable or constrained while it is on. Samsung Galaxy Watch8 and Watch8 Classic User Guide
Watch only: keep the time and little else
Go to Settings > Device care > Battery > Watch only to restrict the watch to showing the time. Choose this only when losing the watch’s other functions is acceptable. Samsung Galaxy Watch8 and Watch8 Classic User Guide
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How do you check what runtime remains?
Open Settings > Device care > Battery to see the battery percentage and remaining-hours estimate. If that estimate looks unexpectedly short, review battery usage and consider whether a recent app or software change coincided with the drop. Change one setting at a time so you can tell what affects your own use. The available Samsung documentation does not establish a universal threshold for a defective battery. Samsung Galaxy Watch8 and Watch8 Classic User Guide
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