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Black rectangular power bank with built-in USB-C cable, 4.5 by 2.9 by 1.1 inches

INIU P51L 20000mAh Power Bank 45W USB-C Cable

SKU CH-6ARH-N396W

A 20000mAh lithium polymer power bank with a built-in USB-C cable delivers up to 45W fast charging for phones and laptops in a compact 4.5 by 2.9 by 1.1 inch form factor

  • Total capacity20,000 mAh
  • Battery chemistryLithium polymer
  • Voltage12
  • Measurements4.5 in × 2.9 in × 1.1 in
  • Product type20,000 mAh
  • Product colorBlack
  • High-capacity 20000 mAh powers devices for days
  • 45 W fast charging reaches 70 % on iPhone 16 in 25 minutes
  • Built-in USB-C cable removes need to carry extra cords
  • Ultra-compact 4.5 in × 2.9 in × 1.1 in fits small bags easily
  • TSA-compliant 100 Wh limit allows carry-on air travel

Compact 20,000 mAh Power Bank

The INIU P51L packs 20,000 mAh of lithium-polymer capacity into a 4.5 by 2.9 by 1.1 inch black enclosure. It is aimed at travellers, students, commuters and office workers who need reliable backup power for weekend trips, workdays or long days away from wall outlets.

Built-in USB-C cable and 45 W output

A captive USB-C cable removes the need to carry a separate cord, reducing clutter in bags and pockets. The unit delivers up to 45 W through Power Delivery and Quick Charge protocols, charging an iPhone 16 to 70 % in 25 minutes or a Samsung S25 Ultra to 80 % in a similar window.

Smart thermal management and recharge times

An internal temperature monitoring system throttles output to prevent overheating, delivering maximum power only while the connected device is low on charge. Recharging the bank itself takes 3.9 hours with a 27 W charger or 6.8 hours with a 15 W adapter via the USB-C port.

How it compares

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

Price $42.99
Pricier than about 63% of the 1,307 comparable items (median $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 does the 45 W USB-C output actually cap at for an iPhone 16?

It charges an iPhone 16 to 70 % in 25 minutes using the built-in USB-C cable.

Will the 4.5 × 2.9 × 1.1 in body fit in a slim laptop sleeve?

The compact 20000 mAh unit measures 4.5 in by 2.9 in by 1.1 in, so it slides into most sleeves and small bags.

How do I recharge the power bank itself and which port do I use?

Recharge only through the USB-C port; a 27 W charger fills it in 3.9 hours, a 15 W charger in 6.8 hours.

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