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Compact black rectangular power bank with built-in USB-C cable visible

INIU P51L 20000mAh Power Bank 45W PD Built-in USB-C Cable Black

SKU CH-18VS-GRSST

A compact 20,000 mAh power bank with a built-in USB-C cable delivers up to 45 W fast charging for phones and tablets

  • Total capacity20,000 mAh
  • Battery chemistryLithium polymer
  • Voltage12
  • Measurements4.5 in × 2.9 in × 1.1 in
  • Product type20,000 mAh
  • Product colorBlack
  • 20000mAh capacity keeps devices running for days
  • 45W PD output charges iPhone 16 to 70% in 25 minutes
  • Built-in USB-C cable means no extra cords to pack
  • Compact 4.5 x 2.9 x 1.1 in size fits any bag
  • Airline-safe 100Wh rating meets TSA carry-on rules

Ultra-Small 20000mAh Power Bank

The INIU P51L packs 20000mAh of lithium-polymer capacity into a 4.5 in by 2.9 in by 1.1 in frame. A built-in USB-C cable removes the need to carry a separate cord. It delivers up to 45W through PD and QC protocols for rapid top-ups. Airline regulations allow it in carry-on luggage.

Travellers and daily commuters

Users who want high capacity without bulk will appreciate the TinyCell design and integrated cable. The 45W output covers phones, tablets and many compact laptops. Buyers who need more storage for multiple laptop cycles should look at higher-capacity units. Those requiring wireless charging or additional output ports will need a different model.

45W USB-C power delivery

The single specification that decides fit is the 45W maximum output over the built-in USB-C connection. It charges an iPhone 16 to 70 percent in 25 minutes and a Samsung S25 Ultra to 80 percent in a similar window. Recharge the bank at 27W in 3.9 hours or at 15W in 6.8 hours. Conversion efficiency sits at 65 percent, yielding roughly 12000 to 14000mAh to devices.

How it compares

Measured against everything we stock in Portable Chargers & Battery Packs, at today’s prices. Recalculated every night.

Price $37.99
Typical for this category: the median of 1,307 items is $36.99.

Specifications

Product
Brand nameINIU
Model nameP51L
Part numberP51L-E1
Total capacity20,000 mAh
Product type20,000 mAh
Product colorBlack
Power
Battery chemistryLithium polymer
Voltage12
Size & build
Measurements4.5 in × 2.9 in × 1.1 in

Questions about this item

What type of USB-C wall charger do I need to recharge this power bank at its fastest rate?

A 27W USB-C charger refills the power bank in 3.9 hours, while a 15W charger takes 6.8 hours.

Can I still use the built-in USB-C cable to charge a phone that only has a USB-A port?

The built-in cable is USB-C on both ends, so you would need a separate USB-A to USB-C cable or adapter for older USB-A devices.

How can I confirm the power bank is delivering fast charging to my phone after I plug it in?

Your phone should show its fast-charge indicator and reach roughly 70% in 25 minutes for an iPhone 16 or 80% for a Samsung S25 Ultra when the power bank is at full capacity.

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