Phone battery capacity

Samsung

Galaxy S23 Ultra

A large Galaxy battery whose rated energy is almost identical to the newer S24 Ultra.

Direct answer

The Galaxy S23 Ultra battery stores 18.83 watt-hours.

Every calculation below uses the model-specific 4,855mAh figure. The separate typical value of 5,000mAh is labelled and not silently mixed with rated capacity.

Rated energy: 18.83Wh
Rated capacity: 4,855mAh
Typical capacity: 5,000mAh
Nominal voltage: 3.88V

Power-bank calculation

How many full charges?

We take 75% of the power bank’s rated Wh and divide it by this phone’s 18.83Wh. This is a planning estimate, not a charging guarantee.

5,000mAh class≈ 0.7×

18.5Wh rated → 13.9Wh planned delivery

10,000mAh class≈ 1.5×

37Wh rated → 27.8Wh planned delivery

20,000mAh class≈ 2.9×

74Wh rated → 55.5Wh planned delivery

(power-bank Wh × 0.75) ÷ 18.83Wh

Capacity is not speed

18.83Wh tells you how much.
Charging power tells you how fast.

Wired chargingUp to 45W wired charging with a compatible 5A USB-C cable and adapter

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

Wireless chargingFast Wireless Charging 2.0 and Wireless PowerShare

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 specificationSamsung 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 Galaxy S23 Ultra battery?

The model-specific source lists 18.83Wh and 4,855mAh. Watt-hours are the useful figure when comparing it with a power bank.

How many times can a 10,000mAh power bank charge the Galaxy S23 Ultra?

A power bank rated around 37Wh provides about 1.5 full charges in this planning calculation. We assume 75% of rated energy reaches the phone battery.

Does 18.83Wh mean the phone charges at 18.83W?

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