A number of complaints regarding the iPhone 3GS‘ battery have surfaced on Apple’s discussion board since the handset’s June 19 launch. Given Apple’s promises of a faster and longer lasting iPhone, it’s understandable that 3GS users, particularly those who have made the jump from the previous models, have higher expectations.

Preliminary battery testing on our iPhone 3GS review model showed positive results, but we won’t know the whole story until CNET Labs finishes its tests. Until that time, I can offer tips on making your iPhone battery last. They can be used individually or in combination to best suit your own needs. Some of these ideas are even recommended by Apple and some of them we’ve mentioned on iPhone Atlas before.

Reset iPhone
In addition to resolving signal strength problems, resetting an iPhone can fix a faulty battery indicator and end applications that are improperly consuming the battery. Hold down the home and sleep buttons simultaneously until you see the white Apple logo indicating that your iPhone has restarted.

Restore with original settings
You can restore your iPhone by launching iTunes and selecting the Restore option on your iPhone’s Summary page. This process will erase your iPhone’s software and data, including all settings. You can restore them later…