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Tame your notifications (and your backlit display)
Notifications alone don't cause battery drainage, but the sheer act of activating the backlit display will. Applications use notifications to inform you of what's going on in the world, such as new emails, text messages, reminders, and who is responding to you on social networks. It's wise to set some notifications to "silent" mode, but this requires some tinkering about in the settings.
Head to Settings > Notification Center, then scroll down. Under each category of notifications that you would like to mute, such as low-priority features like Photos or Game Center, tap through to each setting. Under Alert Style, simply tap None (the left-most graphic). Repeat for each setting.