iPhone Duo Battery Life Results Are In — Here's How It Compares to Other Foldables (and iPhone 18 Pro Max)

Introduction to iPhone Duo Battery Testing

The best foldable phones on the market always come with a set of compromises, and Apple's highly anticipated iPhone Duo is no exception. Users face distinct hardware differences, such as a dual-camera system, a slightly shorter screen compared to standard iPhones, and a more compact battery relative to the massive iPhone 18 Pro Max. However, raw physical size only tells part of the story when it comes to longevity. Energy efficiency, processor optimization, and power consumption play massive roles in daily performance, making rigorous battery testing essential to see how Apple's first foldable truly performs in the wild.

iPhone Duo Battery Life Results

To provide accurate metrics, Tom’s Guide put the iPhone Duo through a custom, rigorous battery life test designed to mimic ordinary, heavy daily use. The test involves continuously surfing the web over a 5G mobile network with the display brightness locked at a consistent 150 nits. For foldable devices, this evaluation is strictly performed using the larger, inner folding screen.

When tested side-by-side with the iPhone 18 Pro Max and the Samsung Galaxy Z Fold 8, the results yielded fascinating insights. The iPhone Duo delivered an impressive 13 hours and 20 minutes of continuous runtime on a 4,883 mAh battery. Meanwhile, the non-folding iPhone 18 Pro Max clocked in at a stellar 17 hours and 31 minutes, benefiting from its larger 5,567 mAh capacity and lack of a secondary power-hungry display.

How the iPhone Duo Compares to Other Foldables

When stacked against prominent Android foldables, the iPhone Duo holds its ground remarkably well. For instance, the Samsung Galaxy Z Fold 8—which features a remarkably similar 4,800 mAh battery—managed just 10 hours and 6 minutes in the latest test run, meaning the iPhone Duo lasts more than three hours longer despite an almost identical cell size. This highlights Apple's superior silicon efficiency and software power management.

Other competitors present varied results: the Samsung Galaxy Z Fold 8 Ultra pushed ahead with 14 hours and 33 minutes thanks to a slightly larger 5,000 mAh battery, while the Google Pixel 11 Pro Fold trailed behind at 12 hours and 31 minutes. On the other end of the spectrum, the Motorola Razr Fold dominated the longevity charts with an incredible 14 hours and 44 minutes, heavily aided by its massive 6,000 mAh power pack.

iPhone Duo Charging Speed and Recharging Performance

Beyond total endurance, charging speeds are critical for modern power users. The iPhone Duo supports up to 60W wired charging, matching the iPhone 18 Pro Max on paper. However, real-world replenishment rates differ. During testing, the iPhone Duo recovered 42% of its battery in 15 minutes and reached 66% after 30 minutes. In comparison, the iPhone 18 Pro Max charged slightly faster, hitting 44% and 77% in the same respective timeframes.

Among foldable rivals, charging experiences vary significantly. The Samsung Galaxy Z Fold 8 and Z Fold 8 Ultra top out at 45W, with the Ultra reaching an impressive 49% in 15 minutes and 76% in half an hour. Meanwhile, the Motorola Razr Fold utilizes up to 80W fast charging to recover 75% in 30 minutes, whereas the Google Pixel 11 Pro Fold lags significantly behind with a modest 30W charging speed that yields only 56% after thirty minutes.

Bottom Line

Ultimately, the iPhone Duo offers middling-to-good battery life within the broader smartphone landscape, though it easily outpaces several prominent foldable competitors despite similar battery capacities. While it cannot match the extreme longevity of single-screen powerhouses like the iPhone 18 Pro Max, it easily provides enough juice to get through a typical day of demanding use. For enthusiasts looking to jump into Apple's foldable ecosystem, the battery trade-offs are entirely manageable.