Pixel 9
The standard Pixel 9 shares its battery size with the smaller Pixel 9 Pro, despite the different model name.The Pixel 9 battery stores 17.77 watt-hours.
The genuine replacement battery lists 4,558mAh at 3.9V. Google separately lists 4,700mAh as the typical capacity; rated and typical capacity should not be silently mixed.
- Rated energy
- 17.77Wh
- Rated capacity
- 4,558mAh
- Typical capacity
- 4,700mAh
- Nominal voltage
- 3.9V
How many full Pixel 9 charges?
We multiply the power bank’s rated Wh by 0.75, then divide by the phone’s 17.77Wh 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) ÷ 17.77WhThree useful sizes for the Google Pixel 9.
These are capacity classes, not paid rankings. The charge count uses this phone’s 17.77Wh 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
- ≈ 1.5×
- Rated energy
- 36Wh
- Fastest USB-C
- 45W
BoostCharge 20K 45W Integrated Cable
- Estimated full charges
- ≈ 3.1×
- Rated energy
- 74Wh
- Fastest USB-C
- 45W
17.77Wh 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 Google Pixel 9 battery?
The genuine replacement battery lists 17.77Wh, 4,558mAh and 3.9V. Watt-hours are the most useful capacity figure when comparing it with a power bank.
What is the Pixel 9 battery capacity in mAh?
The battery evidence lists 4,558mAh. Google separately lists 4,700mAh as typical capacity. Rated and typical figures describe different points, so this page labels them separately.
How many times can a 10,000mAh power bank charge the Pixel 9?
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 Pixel 9?
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 3.1.
Does 17.77Wh mean the Pixel 9 charges at 17.77W?
No. 17.77Wh is stored energy. Charging power is a rate measured in watts; for this model the sourced charging description is Fast USB-C charging with a compatible PPS charger.