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Does brightness decrease battery life on an iPhone 3GS?

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Yes.

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A dimmer screen will help prolong the life of your battery on the iPhone. You can adjust it by going to settings then brightness. If you turn on Auto-Brightness it will adjust the brightness automatically based on the lighting conditions you are in.

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Yes it drains the battery so I put it on low but sometimes I can't even see it so then I put it back on high.

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I think it does but only by a little.

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Dimming your screen to the midway point on the slider will definitely extend your battery life.

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Yeah

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Yeah, a brighter screen uses more power.

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Yes it does and 3G on does as well . Hint! When charging the iPhone turn airplane mode on to charge faster . Airplane mode turned off all data and stuff like that it uses less battery life . Only do it when ur charging while sleep or when u know that ur not getting a call cuz u can't make or receive calls in airplane mode.

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