# INIU P51L 20,000mAh 45W Power Bank

The INIU P51L power bank combines a listed 20,000mAh capacity with a claimed maximum 45W charging output, a built-in USB-C cable and USB-C and USB-A outputs. It is aimed at people carrying a phone or other small devices, though customer feedback also describes it as heavier than expected.

- [Original product page](https://bargainpostbox.co.uk/product/iniu-p51l-20000mah-45w-power-bank)
- [View offer](https://bargainpostbox.co.uk/visit/iniu-p51l-20000mah-45w-power-bank)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: INIU
- Model: P51L
- Category: Electronics > Electronics Accessories > Power Banks
- Price: 27.53 GBP
- Previous price: 32.99 GBP
- Discount: 17%
- Price checked: 2026-11-12T17:44:32.257Z
- Rating: 4.4 / 5
- Reviews: 9235

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- A built-in bidirectional USB-C cable is described as charging devices and recharging the power bank.
- The listing claims up to 45W PD charging and Samsung Super Fast Charging. Actual charging speed depends on the device and charging conditions.
- The listing describes the power bank as 30% smaller than standard 20,000mAh alternatives, while customer feedback includes both pocketability and complaints that it feels heavy.
- The manufacturer states that a 27W wall charger takes 3.9 hours to recharge the bank via USB-C. A 15W charger is listed at 6.8 hours.

## Pros

- Built-in USB-C cable can reduce the need to carry a separate charging lead for compatible devices.
- USB-C and USB-A outputs offer two listed connection options.
- A digital display is listed, providing a charge-status feature.

## Cons

- Customer feedback includes reports of the built-in cable not lasting long and of the power bank stopping work after a few months.
- Some customers consider the unit heavy, despite the listing's compact-size positioning.

## Specifications

### Identity
- Brand: INIU
- Model: P51L
### Power and battery
- Power configuration: Corded Electric
- Battery capacity: 20000 Milliamp Hours
- Battery cell type: Lithium Polymer
- Rechargeability: Rechargeable
- Listed battery count: 1 Lithium Polymer batteries required. \(included\)
- Voltage: 12 Volts
- Claimed maximum charging output: 45W
### Ports and features
- Outputs: Output: USB-C\*1+USB-A\*1
- Number of ports: 2
- Listed features: Built In Cable, Digital Display, Fast Charging, Lightweight, Pocket Size
### Dimensions and installation
- Dimensions listed: 7.1 x 10.4 x 3 centimetres
- Alternative dimensions listed: 11.5L x 7.3W x 2.9Th centimetres
- Listed weight: 320 Grams
### Other details
- Colour: Black
- Manufacturer part number: P51L-E1
- Country of origin: China
- Warranty claim: 3 Years Warranty

## Before you buy

- The listing gives two different sets of dimensions: 7.1 x 10.4 x 3 centimetres and 11.5L x 7.3W x 2.9Th centimetres. Confirm the physical dimensions before purchase. The title and features claim 45W charging, but the listed output ports do not specify per-port or combined output, and simultaneous triple charging is claimed despite two listed output ports. The listing also alternates between describing dual USB-C and USB-A and describing a built-in USB-C cable plus USB-C and USB-A outputs. Confirm the selected product's exact port and cable configuration.

## In the box

- INIU power bank with built-in cable × 1 (Included)
- USB-C cable × 1 (Included)
- User manual ×1 (Included)

## A good fit for

- Phone users wanting a high-capacity portable charger with a built-in USB-C cable.
- Travellers who value the claimed compact format and a choice of USB-C or USB-A output.

## Less suited to

- Buyers prioritising the lightest possible power bank, given feedback that this model can feel heavy.
- Buyers who need fully confirmed dimensions, exact port configuration or per-port output before purchase.

## Customer feedback

Customer feedback highlights fast charging, compact size and portability, with some customers saying the unit fits easily in a pocket. These reported impressions may matter to phone users looking for a high-capacity travel charger. Feedback is mixed on reliability and battery life, including reports of the unit failing after a few months or the built-in cable not lasting, and some customers find it heavy. The aggregate ratings lean positive overall, but do not establish how the unit will perform for an individual buyer.
- Positive themes: Customers praise charging speed, compact size, portability and power.
- Negative themes: Some customers report that the built-in cable does not last long or that the power bank stops working after a few months.
- Negative themes: Some customers consider the power bank heavy.
- Mixed feedback: Customer feedback on reliability and battery life is mixed.

## Frequently asked questions

### Does the INIU P51L have a built-in cable?
The listing describes a built-in, bidirectional USB-C cable. It also lists a separate USB-C cable in the package contents.
### How many devices can it charge at once?
The listing claims simultaneous charging for a phone, earbuds and smartwatch, but lists two output ports and does not clearly establish the cable-and-port configuration. Confirm the selected unit's outputs before relying on three-device charging.
### How long does recharging the power bank take?
The listing states 3.9 hours with a 27W wall charger or 6.8 hours with a 15W charger, and says to recharge via USB-C.
### Is it suitable for air travel?
The manufacturer claims the 20,000mAh model meets its stated airline carry-on capacity limit. Check the applicable airline and airport rules for your journey.

## Offer details

- The manufacturer says recharge time depends on the wall charger used and specifies USB-C for recharging.
- The claimed maximum charging speed may not be delivered continuously. The listing says output is adjusted as a device charges and in response to temperature.

## Alternative options

- [EcoFlow Rapid Powerbank 20,000mAh 45W with a 25cm integrated cable \| PPS, 25cm retractable cable, X-Guard safety technology, 1x USB-C + 1x USB-A, for travel, iPhone, Galaxy](https://bargainpostbox.co.uk/visit/iniu-p51l-20000mah-45w-power-bank)
- [20000mAh Power Bank 45W PD Fast Charger with Built-in USB-C Cable-Black \| Portable Charging, Fast Charging Battery Pack with 2 Output, Built-in USB-C Cable,Digital Power Display](https://bargainpostbox.co.uk/visit/iniu-p51l-20000mah-45w-power-bank)
- [60000mAh Laptop Power Bank USB C 65W Fast Charging Portable Charger \| Built-in Flashlight, Travel Essential, Large Capacity Battery Pack for Laptop,iPhone,iPad,Samsung and Outdoor Activities](https://bargainpostbox.co.uk/visit/bextoo-pc3-power-bank)
- [Power Bank 27000mAh, Portable Charger PD20W & QC4.0 22.5W Fast Charging \| Built-in 3 Cables, 4 Outputs & 3 Inputs, High Capacity, Travel Essential, Battery Pack for iPhone, Samsung, Outdoor](https://bargainpostbox.co.uk/visit/enerwow-a-b-27000mah-power-bank-built-in-cables)
- [INIU Power Bank, Ultra Mini 10000mAh 45W Fast Charging Phone Battery Pack \| Detachable USB C Cable, Flight-Safe, Travel Essential, Portable Charger for iPhone 18 17 16 Pro, Samsung S26, Xiaomi, iPad](https://bargainpostbox.co.uk/visit/iniu-p50-10000mah-45w-power-bank)
- [30W Power Bank Fast Charging, 27000mAh Portable Charger for iPhone DarkBlue \| High Capacity, Emergency Flashlight, LED Display, Travel Essential, Battery Pack Compatible with iPhone 18 17 16 Samsung iPad](https://bargainpostbox.co.uk/visit/iniu-p51l-20000mah-45w-power-bank)
- [INIU Power Bank, Slimmest 10000mAh 45W PD Fast Charging Portable Charger \| Detachable USB-C Cable, Stand, Flight-Safe, Travel, Flashlight, Battery Pack for iPhone 18 17 16 15 Pro, Samsung S26, etc](https://bargainpostbox.co.uk/visit/iniu-p51l-20000mah-45w-power-bank)
- [Anker Nano Power Bank, 45W 10,000mAh Portable Charger, iPhone Battery Pack \| Built-In Retractable USB-C Cable, for iPhone 17 / 16 Series, iPad, Galaxy, Pixel, and More, Compact Travel Design](https://bargainpostbox.co.uk/visit/anker-nano-power-bank-a1638-10000mah-45w-b0dgkwtqqc)
- [VEGER Power Bank 30000mAh,20W PD Fast Charging Portable Charger \| 4 Outputs & 2 Inputs, USB C Battery Pack with LED Display for iPhone, iPad, Android Phones, Tablets](https://bargainpostbox.co.uk/visit/iniu-p51l-20000mah-45w-power-bank)
- [NOBIS Power Bank Fast Charging 45W 20000mAh Portable Charger \| USB C Fast Charging，4 Ports External Battery Pack with LED Digital Display, Compatible with Tablet, Phones etc](https://bargainpostbox.co.uk/visit/iniu-p51l-20000mah-45w-power-bank)
- [For MagSafe Power Bank, 10000mAh 20W Fast Charge Wireless Portable Charger \| Detachable USB C Cable, Strong Magnetic Grip, Slim Battery Pack for Travel, LED Display, for iPhone 18/17/16/15/14/13, Grey](https://bargainpostbox.co.uk/visit/aobbow-w18-10000mah-magnetic-wireless-power-bank)
- [Charmast 22.5W Fast Charging Power Bank, 4 Cables Portable Charger 20000mAh \| USB C Battery Pack, 6 Outputs 4 Inputs Powerbank for Travel, Work, LED Display, Compatible with Smart Phones, Tablets](https://bargainpostbox.co.uk/visit/charmast-c2065-20000mah-225w-power-bank)

## Add-ons

- [INIU 20000mAh Power Bank, 45W Fast Charging Battery Pack 30% Smaller \| Flight-Safe, Built in USB C Cable, Travel Essential, P](https://bargainpostbox.co.uk/visit/iniu-2m-usb-a-to-usb-c-charging-cable)

## Images

![INIU P51L 20,000mAh 45W Power Bank — 1](https://bargainpostbox.co.uk/i/hW2Os5oY64Ydfse80m_sS0l43-66-ypSmwrItMB5euydUG5kxAbmTG3I0ufN8ay5bsPdWSzO71yiqbaz_K_c_JYslpxb9C6eZN1yYpc1zL4noK8OaFUkjznK.jpg)

![INIU P51L 20,000mAh 45W Power Bank — 2](https://bargainpostbox.co.uk/i/z-D53mCAlnAA9RvIbg7rxzAGesbcVVt7w47Fv-xdt8SIx9ESB0vyxOXRSb3GXFGow8HQOIWVvtROMLcNQa9An9glhLKQfc2uVelVgDRNAqW3u3SUcR-r4vjC.jpg)

![INIU P51L 20,000mAh 45W Power Bank — 3](https://bargainpostbox.co.uk/i/bV9MJscigy6kSDxqN91E7VCo2G86DaEpQKHTpHauNkXyr0m8TC2IkZMGz6LtNLWm-NBPPGqilS144ripJmqmwtSRyK-RtwsXpjhANIETnSmJf0a4BaiykeMt.jpg)

![INIU P51L 20,000mAh 45W Power Bank — 4](https://bargainpostbox.co.uk/i/0dN0HU7e_jwdhkrC6tGD-vn5fRpuc7dEDzelgD_cH5C16vYZ5LuM-lWfWR9-f00n4BCqkEx3vD6MO8byfUiM933TKOZjNO0IMa44Xs_lXDrMnq1REsZ9O_zE.jpg)

![INIU P51L 20,000mAh 45W Power Bank — 5](https://bargainpostbox.co.uk/i/Wpqu5gEYtCpMEOzKspyhWKV9Q3PkYI3KOu4ImDINVtCpfBIlfwJFmkS3Oc9hMj_mbdoonvtQdfpiMW-rSaOxmHyj195wtL5-I_P6iIG1EIdgVqA0EQ35q1aE.jpg)

![INIU P51L 20,000mAh 45W Power Bank — 6](https://bargainpostbox.co.uk/i/T2lbpSatw8lFeqxMLW62icdnmdvoOQvxoJn_ZkLa4ty5IY0k0S_ZkWTba4EB67P3EG8aUlkc09WNDzyDIbEe0QpXrVZkw4A34Gb82Ir9KdayiO-gYSBUEzd7.jpg)