According to a report from The Guardian, Apple engineers have started contacting vocal iPhone 4S owners that have been complaining about the rapidly draining iPhone 4S battery. During the initial iPhone 4S presentation earlier this month, Apple mentioned that standby time for the iPhone 4S battery was rated at about 200 hours or a bit over eight days. This is a large drop from the 300 hour standby time of the iPhone 4 and iPhone 3GS, likely due to the upgrades to the internal hardware within the iPhone 4S. One iPhone 4S user reported that standby mode was eating up approximately ten percent of the battery power each hour and eventually draining the battery by the end of the workday.
While Apple engineers haven’t specifically identified the problem yet, many iPhone 4S users have collectively pointed to location services as the main culprit for the drain on the battery. Specifically, the “Setting Time Zone” function within iOS 5 that corrects the Time Zone as a user travels to different areas of the world is constantly attempting to check the current Time Zone. iPhone 4S owners who identified this problem see the purple, location arrow icon beside the toggle setting within the menu. This means that the Time Zone has been checked within the last 24 hours. Users that have turned off the Time Zone feature, as well as many other location functions of the phone, have reported vastly improved battery life on the iPhone 4S as well as other iPhones that have upgraded to iOS 5.
The “Setting Time Zone” function can be located within Settings, moving into “Location Services”, scrolling down to “System Services” and sliding the toggle on “Setting Time Zone”. Apple engineers will likely adjust settings within the next iOS 5 update to modify how often location-based apps are automatically updated to allow for greater battery life for all iPhone 4S users.