Samsung S4 wins both fastest smartphone and best battery-life in UK consumer group's tests
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litterally only 2 hours screen on time I'm on 40% battery with pretty much every app in deep sleep what is up with my battery (exynos galaxy s21) : r/GalaxyS21
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CNET How To - Maximize your Galaxy S4's battery life - YouTube
How to Totally Maximize the Battery Life of Your Samsung Galaxy S4 « Samsung :: Gadget Hacks
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Samsung Mobile on X: "Save battery life by setting your #GALAXYS4 to auto connect/disconnect from a Wi-Fi network. http://t.co/tpcTbolTsQ" / X
Samsung Galaxy S4 battery life tests are done, here's how it did
Galaxy S4 battery saving tips: 6 ways to increase your battery life | nextpit
Galaxy S4 battery saving tips: 6 ways to increase your battery life | nextpit
Galaxy S4: How to Reduce Device Heat and Battery Consumption? | Samsung Pakistan
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