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https://www.ifixit.com/Guide/iPhone+3G+Battery+Replacement/577
iPhone 3G Battery Replacement - iFixit Repair Guide
Is your battery not lasting as long as it used to? Swapping it out for a new one is a snap.
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https://www.macrumors.com/2008/07/14/iphone-3g-battery-life-not-great-but-better-than-most/
iPhone 3G Battery Life Not Great, But Better Than Most - MacRumors
PCWorld has performed some real-life battery testing on the Apple iPhone 3G and found that while its battery is worse than the original iPhone, it...
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https://www.macrumors.com/2011/10/17/iphone-4s-battery-life-worse-for-3g-data-and-media-as-compared-to-iphone-4/
iPhone 4S Battery Life Worse for 3G Data and Media as Compared to iPhone 4 - MacRumors
iLounge publishes their review of the iPhone 4S and provides one of the more extensive battery comparison testing we've seen for the new model. There's been...