Samsung
Galaxy S25 Ultra
Samsung's 2025 Ultra retains the same sourced rated energy as the S24 Ultra, so power-bank charge estimates remain almost unchanged.The Galaxy S25 Ultra battery stores 18.84 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
- 18.84Wh
- Rated capacity
- 4,855mAh
- Typical capacity
- 5,000mAh
- Nominal voltage
- 3.88V
How many full charges?
We take 75% of the power bank’s rated Wh and divide it by this phone’s 18.84Wh. This is a planning estimate, not a charging 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) ÷ 18.84Wh18.84Wh tells you how much.
Charging power tells you how fast.
The phone, USB power adapter and cable must negotiate a compatible charging profile. Use certified equipment suitable for United States.
Alignment, heat and charger certification affect real charging power.
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 US retail availability or an included charger.
Keep energy and charging power separate.
How many Wh is the Galaxy S25 Ultra battery?
The model-specific source lists 18.84Wh 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 S25 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 18.84Wh mean the phone charges at 18.84W?
No. Wh is stored energy; W is charging power at a point in time.