Updated August 20, 2026
This article is continuously updated as new iPhone 18 Pro Max battery certifications, supply-chain information and reliable reports become available.
Quick Answer
The latest regulatory information points to a 5,567mAh battery for the US iPhone 18 Pro Max and 5,391mAh for the China model.
That would be about 9.4% larger than the US iPhone 17 Pro Max battery and about 11.8% larger than the physical-SIM version.
The iPhone 18 Pro Max is also rumored to be around 9mm thick and 240g. Battery life should improve, but Apple has not confirmed the final runtime, charging speed, weight or dimensions.
ZEERA Supply Chain Check: ZEERA is actively developing cases and charging accessories for next-generation iPhones. We compared the public battery and dimensional reports with current accessory-development and supply-chain information available to our team. The direction of a larger Pro Max battery and a slightly thicker body is consistent with what we are seeing. However, we are not treating the exact battery capacity, 240g weight or final dimensions as confirmed retail specifications until Apple announces them.
Latest iPhone 18 Pro Max Battery Update
The battery story has become more credible since the first early-2026 rumors.
More recent regulatory filings point to a 5,567mAh battery for the U.S. iPhone 18 Pro Max and 5,391mAh for versions that retain a physical SIM configuration.
The devices in those filings are not officially named as the iPhone 18 Pro Max, so the numbers should still be described as reported rather than Apple-confirmed specifications.
| Information | Status as of August 20, 2026 |
|---|---|
| 5,567mAh US battery | Reported in regulatory information |
| 5,391mAh China battery | Reported in regulatory information |
| Larger battery than 17 Pro Max | Highly likely based on current information |
| Around 9mm thick | Rumored |
| Around 240g | Rumored |
| Actual battery life | Not confirmed |
| iPhone 18 Pro Max charging speed | Not confirmed |
Apple is expected to introduce the iPhone 18 Pro and iPhone 18 Pro Max in September 2026, which is when final battery-life and charging specifications should become much clearer.
For the complete picture beyond battery life, see our iPhone 18 Pro Max release date, price and specs guide.
What Is the iPhone 18 Pro Max Battery Capacity?
The best current figures are 5,567mAh for the US eSIM model and 5,391mAh for the China physical-SIM model.
If those numbers reach the final retail devices, the iPhone 18 Pro Max would receive one of the largest year-over-year battery capacity increases in recent Pro Max generations.
Is the iPhone 18 Pro Max really getting a 5,567mAh battery?
The 5,567mAh figure is more credible than earlier social-media leaks because it comes from regulatory information rather than only a tipster estimate.
It is still important to distinguish that from an official Apple specification. Apple has not announced the iPhone 18 Pro Max yet.
Why are there two iPhone 18 Pro Max battery sizes?
The most likely reason is the internal space occupied by the physical SIM system.
US iPhones use an eSIM-only design, allowing Apple to use some of the space that would otherwise be required for a physical SIM tray and associated components.
China models are expected to retain a physical SIM configuration, which may explain the smaller reported 5,391mAh battery.
A similar regional difference appears in the latest iPhone 18 Pro battery capacity leak.
iPhone 18 Pro Max vs iPhone 17 Pro Max Battery
| Feature | iPhone 18 Pro Max | iPhone 17 Pro Max |
|---|---|---|
| Status | Unannounced | Available |
| US battery | Reported 5,567mAh | Reported 5,088mAh |
| China / physical-SIM battery | Reported 5,391mAh | Reported 4,823mAh |
| Battery increase | About 9.4% US / 11.8% physical SIM | — |
| Video playback | Not confirmed | Up to 39 hours |
| Thickness | Rumored around 9mm | 8.75mm |
| Weight | Rumored around 240g | 233g |
| MagSafe / Qi2 charging | Not confirmed | Up to 25W |
The biggest change is therefore not simply the raw battery number. Apple may be combining a larger battery with a more efficient processor and other internal efficiency improvements.
How much bigger is the battery?
| Version | iPhone 18 Pro Max | iPhone 17 Pro Max | Increase |
|---|---|---|---|
| US eSIM | 5,567mAh | 5,088mAh | 479mAh / about 9.4% |
| Physical SIM | 5,391mAh | 4,823mAh | 568mAh / about 11.8% |
This is large enough to potentially produce a noticeable real-world difference, especially when combined with the rumored efficiency improvements of the next-generation chip.
How Long Could the iPhone 18 Pro Max Battery Last?
Longer battery life is likely, but there is no confirmed number yet.
Apple rates the iPhone 17 Pro Max for up to 39 hours of local video playback and 35 hours of streamed video playback.
If the iPhone 18 Pro Max combines a roughly 9–12% larger battery with a more efficient A20 Pro chip, it has a realistic opportunity to exceed the current model.
That does not mean a 9% larger battery automatically produces 9% longer battery life.
Battery capacity and battery life are different. Screen brightness, cellular signal, modem efficiency, processor load, temperature, iOS optimization and background activity all affect real-world runtime.
Could the iPhone 18 Pro Max exceed 40 hours of video playback?
It is possible, but any 40-hour-plus claim is currently an estimate rather than an Apple specification.
The final number should not be treated as confirmed until Apple publishes its battery testing results.
Who would notice the larger battery most?
The improvement is likely to matter most to users who regularly use navigation, mobile hotspot, 5G, high display brightness, gaming, video recording or other sustained high-power workloads.
Light users may simply notice that they finish the day with more battery remaining.
Will the A20 Pro improve battery life?
The iPhone 18 Pro models are widely expected to use Apple's first 2nm-generation A20 Pro chip.
A more efficient chip could help Apple convert the larger battery into longer real-world runtime instead of using all of the extra capacity for higher performance.
Read our iPhone 18 Pro Max A20 Pro 2nm analysis for a closer look at the expected efficiency changes.
Will the iPhone 18 Pro Max Charge Faster?
No reliable charging-speed upgrade has been confirmed yet.
The iPhone 17 Pro Max officially supports up to 25W MagSafe and 25W Qi2 wireless charging. Apple also rates it for up to 50% charge in around 20 minutes with a compatible 40W or higher USB-C adapter.
The iPhone 18 Pro Max could keep similar charging speeds, or Apple could increase them. Current battery information alone does not answer that question.
Will a 5,567mAh battery take longer to charge?
Potentially.
If charging power and the charging curve remain similar, a larger battery generally requires more energy and may take slightly longer to reach 100%.
However, Apple can adjust charging power and battery management, so the final charging time cannot yet be calculated reliably.
Will heat affect charging speed?
Yes. Temperature remains one of the most important factors in sustained wireless charging performance.
An iPhone can reduce charging power when temperatures rise, which is why thermal control becomes especially relevant during navigation, gaming or wireless charging in warm environments.
Explore iPhone 18 Pro Max MagSafe chargers for Qi2.2 wireless charging options designed for desk, travel and in-car use. Selected ZEERA models also use active cooling to help manage heat during charging.
iPhone 18 Pro Max MagSafe Charger & Stand
ZEERA MagTri Gen2 Qi2.2 Foldable MagSafe Charger
- 25W Qi2.2
- 3-in-1 fold
- Active cooling
- Travel size
- 3-device ready
ZEERA MagSion 5-in-1 Dual MagSafe Charger Stand
- Dual MagSafe
- 5-in-1 stand
- Watch charging
- Angle adjust
- Clean setup
ZEERA SuVolt Gen5 Qi2.2 Active Cooling Car Charger
- 25W Qi2.2
- Active cooling
- Strong magnet
- CarPlay ready
- Heat control
Will the Bigger Battery Make the iPhone 18 Pro Max Heavier?
Probably.
The latest rumor places the iPhone 18 Pro Max at approximately 240g, compared with the iPhone 17 Pro Max at 233g.
That is only a 7g difference, but the Pro Max is already a large phone, so users who game, record video or use the device one-handed may notice it.
How thick could the iPhone 18 Pro Max be?
The latest estimate is around 9mm.
The iPhone 17 Pro Max measures 8.75mm, so the rumored increase is approximately 0.25mm.
The change itself is small. Its bigger impact may be on accessory tolerances, camera protection, magnetic alignment and case fit.
Why could it be thicker and heavier?
The larger battery is the most obvious explanation.
Apple is also rumored to be changing internal cooling and camera hardware, so the final weight difference may not come from the battery alone.
For more design context, see our reports on the iPhone 18 Pro shell images and possible camera hardware changes.
Explore a wide range of iPhone 18 Pro Max MagSafe cases, or choose an ultra-thin MagSafe back plate if keeping total weight low is a priority.
Will iPhone 17 Pro Max Cases Fit the iPhone 18 Pro Max?
Probably not.
Even a 0.25mm thickness change can matter when combined with changes to the camera platform, buttons, frame shape or internal magnet alignment.
A case may physically go around the phone but still leave the camera, controls or MagSafe accessories incorrectly aligned.
This is particularly important with tightly engineered protective cases, metal frames and camera-protection designs.
Read our full iPhone 17 Pro vs iPhone 18 Pro case compatibility guide before buying an early case.
Should You Upgrade to the iPhone 18 Pro Max for Better Battery Life?
If you already own an iPhone 17 Pro Max, battery capacity alone is probably not enough reason to upgrade.
The iPhone 17 Pro Max already offers up to 39 hours of Apple's rated video playback, so the real question is how much additional runtime the larger iPhone 18 Pro Max battery delivers in everyday use.
Wait for the iPhone 18 Pro Max if:
- Battery life is one of your highest priorities
- You frequently use navigation, gaming, video or hotspot
- You are upgrading from an older iPhone
- You can accept a slightly heavier phone
- You want to see what the 2nm A20 Pro can deliver
Consider the iPhone 17 Pro Max if:
- You need a new phone now
- You find a strong discount
- You want confirmed specifications rather than rumors
- You prefer the slightly lighter design
- Your current battery needs are already covered
Price will also matter. Read our latest iPhone 18 Pro price analysis for the cost factors that could affect the next generation.
How Reliable Are the Current iPhone 18 Pro Max Battery Rumors?
The larger-battery direction now looks considerably stronger than it did earlier in 2026.
The exact 5,567mAh and 5,391mAh figures are supported by regulatory information, while ZEERA's own accessory-development and supply-chain checks are consistent with the broader direction of a larger Pro Max battery.
The 9mm thickness and 240g weight remain less certain because they still depend on leaked information rather than official Apple specifications.
Current Status
Confirmed: iPhone 17 Pro Max is 8.75mm thick, weighs 233g and is rated for up to 39 hours of video playback.
Strongly supported: iPhone 18 Pro Max is moving to a larger battery.
Reported: 5,567mAh US battery and 5,391mAh China battery.
Rumored: Approximately 9mm thickness and 240g weight.
Unknown: Final battery life, charging wattage, charging time and retail specifications.
iPhone 18 Pro Max Battery FAQ
What is the iPhone 18 Pro Max battery capacity?
Current regulatory information points to 5,567mAh for the US model and 5,391mAh for the China model. Apple has not officially announced the phone yet.
Is the iPhone 18 Pro Max battery bigger than the iPhone 17 Pro Max battery?
Yes, based on current reports. The US capacity could rise from 5,088mAh to 5,567mAh.
How much bigger is the iPhone 18 Pro Max battery?
The reported increase is about 9.4% for the US version and about 11.8% when comparing the physical-SIM versions.
Why does the US iPhone 18 Pro Max have a bigger battery?
The US model is expected to remain eSIM-only, leaving more internal space than models that require physical SIM hardware.
Will the iPhone 18 Pro Max have better battery life?
Probably. A larger battery and a more efficient next-generation chip both point toward longer runtime, but Apple has not announced an official battery-life figure.
Will the iPhone 18 Pro Max have 40-hour battery life?
It could exceed the iPhone 17 Pro Max's 39-hour video-playback rating, but a 40-hour-plus figure has not been confirmed.
Will the iPhone 18 Pro Max charge faster?
No reliable charging-speed upgrade has been confirmed yet.
Will a larger battery take longer to charge?
It could if charging power remains unchanged. The final result will depend on battery capacity, charging wattage, thermal management and Apple's charging curve.
How heavy will the iPhone 18 Pro Max be?
The latest rumor points to approximately 240g, around 7g heavier than the iPhone 17 Pro Max.
How thick will the iPhone 18 Pro Max be?
The current estimate is around 9mm, compared with 8.75mm for the iPhone 17 Pro Max.
Will iPhone 17 Pro Max cases fit the iPhone 18 Pro Max?
Probably not. Small changes in thickness, camera dimensions, controls and frame geometry can prevent a correct fit.
Should iPhone 17 Pro Max owners upgrade for the bigger battery?
Probably not for battery capacity alone. Waiting for real-world battery, camera, performance and charging tests will give a much clearer answer.
Bottom Line
The iPhone 18 Pro Max battery is shaping up to be one of the more meaningful upgrades this generation.
The strongest current figures point to 5,567mAh in the US and 5,391mAh in China, compared with 5,088mAh and 4,823mAh respectively for the iPhone 17 Pro Max.
The trade-off may be a slightly thicker and heavier phone at around 9mm and 240g.
For most users, however, the number that matters is not 5,567mAh. It is how many additional hours the iPhone 18 Pro Max can actually deliver during navigation, gaming, photography, video recording and everyday use.
We will continue updating this page as new regulatory information, ZEERA supply-chain checks and official Apple specifications become available.
