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Maximizing your battery life on the samsung galaxy s4 really comes down to turning off as many things as your not using as much as possible. Any features like s beam, nfc, air view just turn off. You can also go into the data usage section and turn off the auto sync option which will disable apps constantly trying to update in the backend. You can also try getting a battery saving app like juice defender which can help quite a bit as well. If nothing else is really helping you then you can check out our 6200mah extended battery with matte back finish which will give you much more juice and make your galaxy s4 last for days.