For some reason, the iPhone 4 and 4S seem to want to know what time zone you are in. This is perfectly acceptable, however, it seems to check this setting way too often, which is another battery-drainer. Unless you are moving from time-zone to time-zone, turning off this setting may save you some precious iPhone battery life. This is an easy thing to turn off in your iOS settings:
Go to the iPhone settings area --> Location Services --> System Services (at the bottom)
Turn off the checkbox that says "Setting Time Zone." This one simple step has increased battery life for a lot of users, at a relatively very low cost. If you decide to go to a different time zone, feel free to enable this temporarily. This may not be a deal-breaker on the iPad, due to the increased battery size, but, turning it off on that device is also helpful for increased iOS battery life.
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