The iPhone Air, the thinnest phone in Apple’s lineup, comes with a modest 3,149 mAh battery. But early tests show the Air can last longer than Samsung ’s Galaxy S25 Edge , which has a bigger 3,900 mAh cell. It lasted 11 hours and 53 minutes, far ahead of the Galaxy S25 Ultra’s 9 hours and 18 minutes. Even the iPhone 17 Pro, with a smaller 3,988 mAh cell, outperformed last year’s iPhone 16 Pro Max, which carried a much bigger 4,685 mAh battery. For now, the iPhone Air proves that bigger isn’t always better.