The iPhone 18 Pro Max has repeatedly been rumored to receive a substantially larger battery, but the numbers circulating online have changed as newer information has appeared. An early leak claimed capacities of 5,425mAh for the eSIM-only model and 5,235mAh for a physical-SIM version, while a later leak said to be based on regulatory information pointed to even larger 5,567mAh and 5,391mAh batteries. The important point is that none of these iPhone 18 Pro Max battery capacities has been officially confirmed by Apple, so they should be treated as evolving pre-release information rather than final specifications.
What the Original 5,425mAh Battery Leak Claimed
An early July 2026 rumor claimed that Apple was preparing two different battery capacities for the iPhone 18 Pro Max. The eSIM-only version was listed at 5,425mAh, while a model retaining a physical SIM tray was listed at 5,235mAh.
| iPhone 18 Pro Max Version | Early Rumored Capacity | Status |
|---|---|---|
| eSIM-only | 5,425mAh | Unconfirmed |
| Physical SIM | 5,235mAh | Unconfirmed |
Those figures attracted attention because both would represent clear increases over equivalent iPhone 17 Pro Max configurations. The sourcing behind the original figures was uncertain, however, making it inappropriate to present either number as an established specification.
The 5,425mAh figure was a leak about an unreleased phone, not an official Apple battery specification.
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