INIU P512 20,000mAh 22.5W Power Bank

The INIU P512 power bank combines a listed 20,000mAh capacity with 22.5W output and three charging ports in a compact-format portable charger. Its two USB-C ports support input and output, while USB-A provides an additional output. Customer feedback is positive about size and portability overall, but charging-speed experiences vary.

At a glance

The listed three-port layout has two USB-C ports for input and output, plus one USB-A output.
INIU claims 22.5W fast charging and states that a phone can reach 75% in 25 minutes. Actual speed depends on the connected device and charging conditions.
The listing describes the unit as small for its 20,000mAh capacity and gives dimensions of 10.4 x 2.9 x 7 centimetres.
The manufacturer says its low-current charging mode supports lower-power devices.

Price

£27.96Save 24%

Reference price: ~~£36.99~~

Price checked: 12 Nov 2026

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Often bought together

INIU Power Bank, Smallest 20000mAh 22.5W Fast Charging Portable Charger | Detachable USB C Cable, Flight-Safe, Travel Essenti

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Pros and cons

Pros

20,000mAh listed capacity and three output ports support carrying one bank for several devices.
USB-C input and output offers a way to recharge the bank and charge devices through the same port type.
Manufacturer-listed dimensions are compact, and customer feedback also highlights portability.

Technical specifications

11 specifications

Identity and power
Brand	INIU
Model	P512
Battery capacity	20000 Milliamp Hours
Maximum output wattage	22.5 Watts
Port configuration	Output: USB-C2+USB-A1
Number of ports	3
Battery cell type	Lithium Polymer
Battery charge time	5.4 Hours

Dimensions and physical details
Dimensions listed	10.4 x 2.9 x 7 centimetres
Weight listed	313.5 Grams
Colour	Black

What to know before buying

Listing details to confirm

The listing says 5.4 hours to recharge, while its details give different times by charger: 5.4 hours with a 20W charger and 6.6 hours with a 15W fast charger. It specifies recharging through USB-C. The title claims the smallest 20,000mAh bank, but no comparison evidence is supplied. The product dimensions are consistently listed as 10.4 x 2.9 x 7 centimetres, while the claimed weight differs between 313.5 Grams for the item and 320 Grams for the battery. Confirm these listing details and the selected model before buying.

Who is it for?

A good fit for

People wanting a high-capacity portable charger with USB-C input/output and a separate USB-A output.
Travellers who prioritise a compact listed size and need to charge phones or other low-current devices on the move.
Buyers who can tolerate variable charging speeds and will check their device’s charging compatibility.

Less suited to

Anyone requiring a confirmed charging speed for a particular phone or a guaranteed full-recharge time across different wall chargers.
Buyers who need a verified size comparison to establish that this is the smallest option in its capacity class.

INIU P512 20,000mAh 22.5W Power Bank · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 135 ratings

5 stars74%74%
4 stars16%16%
3 stars2%2%
2 stars5%5%
1 star3%3%

Customer feedback highlights compact size, portability and generally good performance, while reports about charging speed are mixed, with some finding it quick and others slow. That variation matters if charging time is a priority. The listed 22.5W output is a manufacturer claim and does not establish the speed a particular device will achieve. Ratings are mostly five-star, though a smaller share are lower, so the overall positive picture does not remove the reported speed concerns.

Positive themes

Customers describe the power bank as compact and portable, and some say they take it with them regularly.
Customer feedback describes performance positively and considers it worth the money.

Mixed feedback

Charging speed receives mixed feedback, with some customers reporting fast charging and others saying it is slow.

Frequently asked questions

How many ports does the INIU P512 have?

The listing specifies three ports: two USB-C ports with input and output, and one USB-A output port.

How long does it take to recharge the power bank?

The listing gives 5.4 hours with a 20W charger and 6.6 hours with a 15W fast charger, and says to recharge through USB-C. The headline charge-time field lists 5.4 hours.

Does it charge every phone at 22.5W?

The listing claims up to 22.5W output, but actual charging speed depends on the connected device and conditions. Customer feedback reports mixed experiences with speed.