Apple’s September lineup is full of ‘up to’ figures, and each one has its own comparison point. Some name the baseline explicitly, such as Series 11 or a preproduction testing date. Others simply say ‘than before’ without naming a generation, or list two figures for what looks like identical hardware without explaining the gap.
None of this is a discrepancy to resolve. It is how Apple’s own pages are written, and the wording is checkable directly against those pages.
The battery figures, and the preproduction footnote
| Claim | What it is measured against |
|---|---|
| iPhone 18 Pro, up to 36 hours video playback; Pro Max, up to 45 hours | Apple’s own testing footnote: ‘Testing conducted July 2026 with preproduction units’ |
| iPhone Duo, up to 44 hours video playback on the outer display, up to 31 hours on the inner display | Two separate figures for the same battery, tied to which display is in use |
| iPhone Duo, mixed use up to 24 hours | Apple states this figure ‘assumes equal inner and outer display use’ |
The mixed-use figure is the clearest case of Apple naming its own assumption. The outer and inner figures are each real, on-the-record numbers, but they describe two different ways of holding the same phone, not two different phones.
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Apple Watch: some claims name Series 11, some just say ‘before’
Apple Watch Series 12’s sensing claims are precise about the comparison: ’60x more frequent background heart rate readings than Series 11′ and ’24x more frequent HRV readings than Series 11.’ Both name the exact prior generation.
The battery and charging claims on the same page do not name a generation the same way. Apple states outdoor workout battery life as ‘up to 10 hours,’ with a parenthetical of ’25 percent more than before,’ and the 15-minute charge as ‘up to 12 hours of normal use,’ ’50 percent faster than before.’ ‘Before’ is not spelled out as Series 11 in that sentence, even though the surrounding claims are about the Series 12 launch specifically.
One chip, two different comparisons
The A20 Pro chip inside both iPhone 18 Pro and iPhone Duo carries two ‘up to’ figures with two different baselines. Apple states the 6-core CPU is ‘up to 20 percent faster’ and the 7-core GPU ‘up to 40 percent faster’ than A19 Pro, the prior chip. Separately, Apple claims 35 percent better sustained performance for iPhone Duo specifically than iPhone 17 Pro, a comparison against the whole prior phone rather than against the chip alone.
A chip-level number and a device-level number describe two different things, even when they are about the same processor generation. Neither figure states the test conditions behind the other. See our A20 Pro chip explainer for the rest of Apple’s published figures.
AirPods 5: the same ‘up to’ phrase, two different numbers
| Model | Listening time with ANC on, one charge |
|---|---|
| AirPods 5 (standard, $129) | Up to 4 hours |
| AirPods 5 with Wireless Charging Case ($149) | Up to 5 hours |
Both figures appear on Apple’s own store and product pages, for two AirPods that share the same H2 chip, the same driver, and the same published dimensions and weight. Apple does not explain the one-hour gap anywhere in the material reviewed. It is simply two ‘up to’ numbers, attached to two SKUs, on the same page.
Reading an ‘up to’ figure before you buy
The practical takeaway is to check what sits next to the number, not just the number itself. A figure with a named generation, a named test date or a stated usage assumption is a narrower, more checkable claim than one that simply says ‘before’ or leaves the comparison out. Our iPhone 18 Pro battery life breakdown and Apple Watch Ultra 4 battery figures list the full set for each device.
What Apple has not said
Apple has not published the test conditions behind every ‘up to’ figure in this lineup, has not explained the AirPods 5 listening-time gap between its two SKUs, and has not stated whether the Watch’s uncredited ‘before’ comparisons refer to Series 11 or to an average across older models.
iPhone 18 Pro and iPhone Duo pre-order and specs pages remain live on Apple’s store as of September 12, ahead of the September 18 and October 23 release dates, so each figure above can still be checked directly against the source.
