Apple has made significant battery improvements across recent iPhone generations. This guide compares the iPhone 15, 16, and 17 series to help you understand what to expect from each.
Battery Capacity Comparison
Apple measures battery life in hours of usage, but capacity (measured in mAh) shows the raw energy storage:
| Model | Battery Size | Video Playback | Designed Cycles |
|---|---|---|---|
| iPhone 15 | 3,349 mAh | Up to 20 hours | 1,000 cycles |
| iPhone 15 Plus | 4,383 mAh | Up to 26 hours | 1,000 cycles |
| iPhone 15 Pro | 3,274 mAh | Up to 23 hours | 1,000 cycles |
| iPhone 15 Pro Max | 4,422 mAh | Up to 29 hours | 1,000 cycles |
| iPhone 16 | 3,561 mAh | Up to 22 hours | 1,000 cycles |
| iPhone 16 Plus | 4,674 mAh | Up to 27 hours | 1,000 cycles |
| iPhone 16 Pro | 3,582 mAh | Up to 27 hours | 1,000 cycles |
| iPhone 16 Pro Max | 4,685 mAh | Up to 33 hours | 1,000 cycles |
| iPhone 17 / Air | ~3,800+ mAh | Up to 28+ hours | 1,000+ cycles |
Curious about your own battery? Manufacturers rate them for specific cycles, but real-world usage varies. Check your estimated health with our Battery Health Estimator.
Key Battery Improvements
iPhone 15 Series (2023)
- First iPhones with 1,000 cycle rating (double the previous 500)
- USB-C charging for all models
- Improved power efficiency with A17 Pro chip
iPhone 16 Series (2024)
- Larger batteries across all models
- More efficient A18/A18 Pro processors
- Faster MagSafe charging (up to 25W with compatible chargers)
- Improved thermal management
iPhone 17 / iPhone Air (2025)
- New stacked battery technology for higher density
- Further processor efficiency gains
- Enhanced Optimized Battery Charging algorithms
- Thinner design with maintained battery life
Real-World Battery Life
Apple's video playback numbers are tested under ideal conditions. Real-world usage varies:
| Usage Type | iPhone 15 Pro | iPhone 16 Pro | iPhone 17 |
|---|---|---|---|
| Light use | 1.5 days | 2 days | 2+ days |
| Moderate use | Full day | Full day+ | Full day+ |
| Heavy use | 6-8 hours | 8-10 hours | 10+ hours |
Charging Speed Comparison
Newer iPhones support faster charging:
- iPhone 15 series: Up to 27W wired, 15W MagSafe
- iPhone 16 series: Up to 30W+ wired, 25W MagSafe (with compatible charger)
- iPhone 17 series: Faster charging with improved thermal management
Track Your iPhone's Battery Health
Regardless of which iPhone you have, tracking your battery health helps you maximize its lifespan. Battery Health Pro works with all iPhone models to:
- Track charging cycles and patterns
- Compare your battery to similar devices
- Predict future degradation
- Get personalized recommendations
Compare your battery to similar devices
Download Battery Health Pro Free
For pure battery life: iPhone 16 Pro Max > iPhone 16 Plus > iPhone 15 Pro Max. Consider the Plus models for best value.
Which iPhone Has the Best Battery?
For pure battery life, the ranking is:
- iPhone 16 Pro Max: Best overall battery life
- iPhone 17 Pro Max: Similar with efficiency gains
- iPhone 16 Plus: Best value for battery life
- iPhone 15 Pro Max: Still excellent
