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How can increase the battery lifespan of a iphone 3gs?

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I want to buy iphone 3gs, but I don’t know about the features and the apps which are available in it. I would also like to know the iphone 3gs battery life because old phone had a very bad battery life. And I don’t want this mistake to happen again. Please help me by sending your valuable suggestion. They will be dearly appreciated. Thanks in advance.

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