Photo: Apple · source ↗Manufacturer device image for this battery profile — not a removed battery.

Phone battery capacity

Apple

iPhone 13 Pro Max

The largest iPhone 13 battery stores nearly 80% more energy than the mini and therefore changes every power-bank estimate.

Direct answer

The iPhone 13 Pro Max battery stores 16.75 watt-hours.

Every calculation below uses the model-specific 4,352mAh figure. This is not a generic smartphone assumption.

Rated energy: 16.75Wh
Rated capacity: 4,352mAh
Nominal voltage: 3.85V

Power-bank calculation

How many full charges?

We take 75% of the power bank’s rated Wh and divide it by this phone’s 16.75Wh. This is a planning estimate, not a charging guarantee.

5,000mAh class≈ 0.8×

18.5Wh rated → 13.9Wh planned delivery

10,000mAh class≈ 1.7×

37Wh rated → 27.8Wh planned delivery

20,000mAh class≈ 3.3×

74Wh rated → 55.5Wh planned delivery

(power-bank Wh × 0.75) ÷ 16.75Wh

Capacity is not speed

16.75Wh tells you how much.
Charging power tells you how fast.

Wired chargingFast-charge capable with a 20W or higher adapter

The phone, USB power adapter and cable must negotiate a compatible charging profile. Use certified equipment suitable for Canada.

Wireless chargingUp to 15W with MagSafe; up to 7.5W with Qi

Alignment, heat and charger certification affect real charging power.

Evidence

Two sources with different jobs.

The manufacturer supports the phone and charging claims. The model-specific battery source supplies the figures used in the calculation. These technical figures do not prove Canadian retail availability or an included charger.

Manufacturer specificationApple specifications ↗Model-specific battery evidenceBattery data via iFixit ↗Sources checked 2026-08-21. We have not physically tested this phone.

Frequently asked

Keep energy and charging power separate.

How many Wh is the iPhone 13 Pro Max battery?

The model-specific source lists 16.75Wh and 4,352mAh. Watt-hours are the useful figure when comparing it with a power bank.

How many times can a 10,000mAh power bank charge the iPhone 13 Pro Max?

A power bank rated around 37Wh provides about 1.7 full charges in this planning calculation. We assume 75% of rated energy reaches the phone battery.

Does 16.75Wh mean the phone charges at 16.75W?

No. Wh is stored energy; W is charging power at a point in time.