Updated July 13, 2026
The iPhone 18 Pro Max may get a much larger battery than the iPhone 17 Pro Max. The trade-off could be a slightly thicker and heavier body.
Here is what the latest numbers may mean for battery life, daily use and your upgrade decision.
Quick Answer
The iPhone 18 Pro Max may have a battery up to 5,567mAh, compared with the reported 5,088mAh battery in the US iPhone 17 Pro Max. It could also be around 0.25mm thicker and 7g heavier.
That makes the iPhone 18 Pro Max more attractive for battery life, while the iPhone 17 Pro Max remains the lighter, confirmed option. Current iPhone 17 Pro Max owners may not need to upgrade for the battery alone.
iPhone 18 Pro Max vs iPhone 17 Pro Max: Quick Comparison
| Feature | iPhone 18 Pro Max | iPhone 17 Pro Max |
|---|---|---|
| Status | Unannounced | Available |
| US battery | Rumored 5,567mAh | Reported 5,088mAh |
| China battery | Rumored 5,391mAh | Reported 4,823mAh |
| Battery life | Expected to improve | Up to 39 hours of video playback |
| Thickness | Rumored around 9mm | 8.75mm |
| Weight | Rumored around 240g | 233g |
| Charging | Not confirmed | Up to 25W MagSafe and Qi2 |
| Main advantage | Potentially longer battery life | Lighter and already tested |
The iPhone 17 Pro Max figures are confirmed or based on existing regulatory data. The iPhone 18 Pro Max figures remain unofficial.
For a broader look at release timing, camera, chip and pricing rumors, read our complete iPhone 18 Pro Max guide.
iPhone 18 Pro Max vs iPhone 17 Pro Max Battery and Charging
Battery Capacity Comparison
Recent regulatory information points to two possible iPhone 18 Pro Max battery sizes:
- US eSIM model: 5,567mAh
- China physical-SIM model: 5,391mAh
The reported iPhone 17 Pro Max capacities are 5,088mAh in the US and 4,823mAh in China.
| 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% |
If accurate, this would be a meaningful annual increase rather than a minor battery adjustment.
Why Could the US Battery Be Larger?
US iPhones use an eSIM-only layout. Removing the physical SIM tray leaves more internal space for the battery and other components.
China models are expected to keep a physical SIM tray, which may explain the smaller capacity. A similar difference appears in the latest iPhone 18 Pro battery leak.
Will the iPhone 18 Pro Max Have Better Battery Life?
Probably, but battery capacity does not tell the whole story.
The iPhone 17 Pro Max is rated for up to 39 hours of local video playback and 35 hours of streamed video playback. Apple has not published comparable figures for the iPhone 18 Pro Max.
A larger battery could help most during:
- 5G and mobile hotspot use
- Navigation
- 4K video recording
- Mobile gaming
- High outdoor brightness
- On-device AI processing
The rumored A20 Pro chip may also improve efficiency. However, screen-on time and gaming battery life cannot be predicted accurately before independent testing.
A 9% larger battery does not automatically mean 9% longer battery life. Display efficiency, signal strength, heat, software and processor load also affect the final result.
Will the Bigger Battery Take Longer to Charge?
It could, if Apple keeps the same charging power.
The iPhone 17 Pro Max supports up to 25W MagSafe and Qi2 charging. It can also reach 50% in about 20 minutes with a compatible 40W or higher USB-C adapter.
No reliable iPhone 18 Pro Max charging upgrade has been confirmed. A larger battery may therefore take slightly longer to fill unless Apple increases the charging rate.
Heat control will remain important. High temperatures can reduce sustained wireless charging speed and place more stress on the battery over time.
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iPhone 18 Pro Max vs iPhone 17 Pro Max Thickness and Weight
Thickness Comparison
The latest rumor places the iPhone 18 Pro Max at around 9mm thick.
The iPhone 17 Pro Max measures 8.75mm, creating a difference of about 0.25mm.
Most users are unlikely to notice that change by itself. It may matter more for case fit, camera protection and accessory alignment.
Weight Comparison
The iPhone 18 Pro Max may weigh around 240g, compared with 233g for the iPhone 17 Pro Max.
Seven grams is a small increase, but the Pro Max is already a large phone. The difference may become more noticeable during gaming, filming or one-handed use.
Is 240g Too Heavy?
That depends on how you carry the phone.
A 30g case would bring a 240g iPhone close to 270g. Adding a MagSafe wallet or camera accessory would increase the total further.
However, 240g would not be a new record. The iPhone 13 Pro Max and iPhone 14 Pro Max also weighed 240g.
Why Could the iPhone 18 Pro Max Be Heavier?
The larger battery is the most likely reason.
Apple may also revise the camera structure, internal frame and vapor chamber cooling system. Each change could add a small amount of weight.
Frame material alone does not determine the result. Battery, cameras, cooling and internal supports all affect the final weight.
For more design context, see our reports on the iPhone 18 Pro shell images and possible camera hardware changes.
The larger battery is the most likely reason, although camera, frame and cooling changes may also add weight.
Explore a wide range of ZEERA MagSafe cases, or choose an ultra-thin MagSafe back plate for a lighter, case-free feel.
Will iPhone 17 Pro Max Cases Fit the iPhone 18 Pro Max?
Probably not.
Even small changes to thickness, camera size, buttons or frame shape can prevent a proper fit. A case may attach but still leave the camera or controls misaligned.</p>
Read our full case compatibility guide before buying an early iPhone 18 Pro Max case.
Should You Upgrade to the iPhone 18 Pro Max?
If You Already Own an iPhone 17 Pro Max
Do not plan an upgrade based on battery capacity alone.
The iPhone 17 Pro Max already has strong battery life. A yearly upgrade will make more sense only if Apple also improves the camera, performance, cooling or charging experience.
Wait for the iPhone 18 Pro Max if:
- Battery life is your top priority
- Your current phone still works well
- You frequently game, film or use navigation
- You can accept a heavier phone
- You are upgrading from an older model
Buy the iPhone 17 Pro Max if:
- You need a phone now
- You find a strong discount
- You prefer confirmed specifications
- You want the lighter option
- You do not want to wait for an unannounced product
Price may also change the decision. Read our latest iPhone 18 Pro price analysis for the cost risks facing the next generation.
How Reliable Are the Current Rumors?
The larger-battery direction appears credible, but the exact numbers are not final.
Recent regulatory information points to 5,567mAh and 5,391mAh batteries. Earlier reports listed slightly smaller figures.
Thickness estimates have also changed during the rumor cycle. The latest figure is around 9mm, but Apple has not confirmed it.
- Confirmed: iPhone 17 Pro Max is 8.75mm thick and weighs 233g.
- Likely: iPhone 18 Pro Max will have a larger battery.
- Unconfirmed: 9mm thickness and 240g weight.
- Unconfirmed: 5,567mAh and 5,391mAh capacities.
- Unknown: Final charging speed and battery life.
FAQ
Is the iPhone 18 Pro Max battery bigger than the iPhone 17 Pro Max battery?
Current reports suggest yes. The US capacity could increase from 5,088mAh to 5,567mAh, although Apple has not confirmed it.
Will the iPhone 18 Pro Max have better battery life?
A larger battery makes an improvement likely. Real-world results will also depend on the chip, modem, display, software and heat.
What is the rumored iPhone 18 Pro Max battery capacity?
The latest figures are 5,567mAh for the US model and 5,391mAh for the China model.
Why could the US battery be larger?
The US eSIM-only layout removes the physical SIM tray, leaving more internal space for the battery.
Is the iPhone 18 Pro Max heavier?
It may weigh around 240g, approximately 7g more than the iPhone 17 Pro Max.
Is 240g too heavy?
It depends on the user and the case. The total could approach 270g after adding a typical protective case.
How thick could the iPhone 18 Pro Max be?
The latest estimate is around 9mm, compared with 8.75mm for the iPhone 17 Pro Max.
Will it support faster charging?
No reliable charging upgrade has been confirmed. A bigger battery does not automatically mean faster charging.
Will the larger battery take longer to charge?
It could if Apple keeps the same charging power. The final time will depend on capacity, wattage, heat and the charging curve.
Will iPhone 17 Pro Max cases fit?
Probably not. Small changes to the body, camera platform or buttons can prevent a correct fit.
Should iPhone 17 Pro Max owners upgrade?
Probably not for battery capacity alone. Wait for confirmed camera, performance and battery-life tests.
Bottom Line
The iPhone 18 Pro Max may offer a substantially larger battery, but it could also be slightly thicker and around 7g heavier.
That trade-off makes sense for users who value battery life. It is less compelling for people who already find the iPhone 17 Pro Max heavy.
Current iPhone 17 Pro Max owners should wait for real battery-life tests. Users with an older iPhone may have a stronger reason to wait for the complete iPhone 18 Pro Max upgrade.
