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So there 3 main ways to improve the battery life on your samsung galaxy s4. The first thing you want to do is turn off autosyncing on your galaxy s4. The second thing you want to do is getting a battery saving app, and fortunately there are lots of free apps for this. And the last thing is to just get a new battery. If your still using the stock samsung battery it has most likely worn out. You can check out our 6200mah extended battery with matte back which will give you almost 3 times as much power as the original samsung battery.