Independent lab testing shows that the latest iPhone 18 Pro and Pro Max offer only slight improvements in battery endurance, contrasting with Apple’s claims of significant gains, highlighting incremental rather than revolutionary advancements.
Apple has been promoting the iPhone 18 Pro and iPhone 18 Pro Max as major gains for battery endurance, but independent testing suggests the reality is more restrained. In its announcement material, the company highlighted what it called the “largest increase in battery life ever” on an iPhone Pro Max compared with the previous generation. Yet TechRadar’s lab work, which used continuous web browsing over cellular with location services, Wi-Fi, Bluetooth and battery-management features switched off, found that the improvements were real but modest rather than dramatic.
In that test, the iPhone 18 Pro lasted 16 hours and 17 minutes, up from 15 hours and 21 minutes on the iPhone 17 Pro. The iPhone 18 Pro Max reached 18 hours and 27 minutes, compared with 17 hours and 54 minutes for the iPhone 17 Pro Max. That makes the smaller Pro about 6% better and the larger model roughly 3% better in this particular scenario. TechRadar said the figures are welcome, but they fall well short of the scale suggested by Apple’s marketing language.
The gap between Apple’s claims and the lab results is easier to understand once the company’s own figures are considered. Apple typically quotes video playback times, where the iPhone 18 Pro is rated for up to 36 hours and the iPhone 18 Pro Max for up to 45 hours. Those figures amount to increases of around 9% and 15% respectively over the prior Pro models, and MacRumors noted that Apple also ties the gains to the efficiency of the A20 Pro chip. However, Apple’s small print still stresses that network conditions, settings and usage patterns can change results materially, and the company says actual battery life will vary.
Reported battery capacities also help explain why the iPhone 18 Pro Max is being framed as a standout upgrade. MacRumors and The Mac Observer both reported that the Pro model carries a larger battery than before, with the Pro Max pushing beyond the 5,500mAh mark in some teardown-based estimates. Tom’s Guide said iFixit’s teardown pointed to a 4,288mAh battery in the iPhone 18 Pro and 5,567mAh in the Pro Max, with the latter contributing to a weight of 249g. Apple does not officially publish mAh figures, but the combination of a larger battery, a more efficient chip and faster charging support does point to a meaningful, if not transformational, improvement.
For buyers, the practical conclusion is straightforward. The iPhone 18 Pro range should last longer than its predecessors, and the Pro Max remains the endurance leader in Apple’s line-up. But unless usage is dominated by long, uninterrupted video playback, the real-world uplift appears to be incremental rather than revolutionary.
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