Apple
iPhone 15 Pro Max
The largest iPhone 15 battery needs about one-third more energy per full recharge than the iPhone 15 Pro.The iPhone 15 Pro Max battery stores 17.1 watt-hours.
The model-specific replacement battery listing lists 4,422mAh at 3.86V. This model-specific battery value is used for every calculation below.
- Rated energy
- 17.1Wh
- Rated capacity
- 4,422mAh
- Nominal voltage
- 3.86V
How many full iPhone 15 Pro Max charges?
We multiply the power bank’s rated Wh by 0.75, then divide by the phone’s 17.1Wh battery. The result is a planning estimate, not a laboratory guarantee.
18.5Wh rated → 13.9Wh planned delivery
37Wh rated → 27.8Wh planned delivery
74Wh rated → 55.5Wh planned delivery
(power-bank Wh × 0.75) ÷ 17.1WhThree useful sizes for the Apple iPhone 15 Pro Max.
These are capacity classes, not paid rankings. The charge count uses this phone’s 17.1Wh battery and the same 75% delivered-energy allowance.
Hybrid Wall Charger + Power Bank 5K
- Estimated full charges
- ≈ 0.8×
- Rated energy
- 18.5Wh
- Fastest USB-C
- 25W
Nano Power Bank 10K 45W
- Estimated full charges
- ≈ 1.6×
- Rated energy
- 36Wh
- Fastest USB-C
- 45W
BoostCharge 20K 45W Integrated Cable
- Estimated full charges
- ≈ 3.2×
- Rated energy
- 74Wh
- Fastest USB-C
- 45W
17.1Wh tells you how much.
Charging watts tell you how fast.
The phone, charger and cable must negotiate the same charging profile.
Alignment, heat and charger certification can reduce real wireless power.
Two sources, two different jobs.
The manufacturer page supports the phone and charging claims. The model-specific iFixit source supplies the battery figures used here; where voltage is not printed, it is explicitly labelled as derived. Replacement parts are labelled as genuine or aftermarket according to that source.
Keep energy and charging power separate.
How many Wh is the Apple iPhone 15 Pro Max battery?
The model-specific replacement battery listing lists 17.1Wh, 4,422mAh and 3.86V. Watt-hours are the most useful capacity figure when comparing it with a power bank.
What is the iPhone 15 Pro Max battery capacity in mAh?
The battery evidence lists 4,422mAh. Rated and typical figures describe different points, so this page labels them separately.
How many times can a 10,000mAh power bank charge the iPhone 15 Pro Max?
A 37Wh power bank gives about 1.6 full charges in our planning calculation. That assumes 75% of the power bank's rated energy reaches the phone battery; actual results vary.
What size power bank is useful for the iPhone 15 Pro Max?
A 10,000mAh-class power bank rated around 36–37Wh is a practical everyday class and gives about 1.6 full charges in this calculation. A smaller 18.5Wh pack gives only about 0.8 charge, while a 74Wh pack gives about 3.2.
Does 17.1Wh mean the iPhone 15 Pro Max charges at 17.1W?
No. 17.1Wh is stored energy. Charging power is a rate measured in watts; for this model the sourced charging description is Fast-charge capable with a 20W or higher USB-C adapter.