Based on insights from several supply chain insiders, Apple's inaugural foldable iPhone is currently in the testing phase, featuring a battery with a capacity ranging from 5400mAh to 5800mAh. When it hits mass production, the device will come standard with a battery of at least 5400mAh. This will not only eclipse the 5088mAh battery found in the iPhone 17 Pro Max but also make it the Apple mobile device with the most substantial battery capacity to date. Some reports even hint that the battery capacity could soar past 5500mAh, potentially setting an unprecedented record for iPhones. In comparison to similar foldable flagship models, like the Google Pixel 10 Pro Fold with its 5015mAh battery and the Samsung Galaxy Z Fold 7's 4400mAh, Apple's latest offering is poised to take the lead in terms of battery specifications. Apple is placing a strong emphasis on energy efficiency enhancements, leveraging high-density batteries to strike an optimal balance between device slenderness and battery longevity, thereby tackling the prevalent concerns regarding battery life in foldable screen devices.