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Cheat! Buy an external battery
If all else fails and battery life continues to be a problem, consider an external battery pack, or carry around a USB charger with you. Some external batteries will extend the battery life of your iPhone for twice the ordinary length, if not longer. There are some wrap-around cases that clip to your phone and can be activated with a switch, though these will make your iPhone thicker in size and heavier to carry. Others plug into the charging port at the bottom to give your iPhone additional juice.