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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 Black

SKU CH-BMKT-3T224

A 20,000 mAh portable charger 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 output charges iPhone 16 to 70% in 25 minutes
  • Built-in USB-C cable means no extra cords to carry
  • Charges three devices at once for phone, tablet and more
  • Flight-safe 100Wh rating meets TSA carry-on regulations

Compact 20,000mAh Power Bank

The INIU P51L is a 20,000mAh lithium-polymer power bank finished in black. It measures 4.5 in by 2.9 in by 1.1 in and uses high-density TinyCell battery technology to keep the footprint small. The unit supplies up to 45W output through USB Power Delivery and Quick Charge protocols, making it suitable for phones, tablets and other USB-C devices. Travellers benefit from a built-in USB-C cable that removes the need to carry a separate lead.

Thermals, noise and power draw

The pack operates silently with no moving parts. A Smart Temperature Monitoring System regulates output to prevent overheating, delivering maximum power when a device is low on charge and reducing power as the battery fills. Typical conversion efficiency is 60 to 70 percent, so a full 20,000mAh bank yields roughly 12,000 to 14,000mAh to connected devices. Recharging the bank takes about 3.9 hours with a 27W charger or 6.8 hours with a 15W charger via the USB-C port.

Built-in cable and multi-device charging

The integrated USB-C cable means you can charge immediately without hunting for a cord. Three devices can be powered simultaneously from the combined outputs. At 20,000mAh the unit sits under the 100Wh airline limit (approximately 27,027mAh), so it is approved for carry-on baggage. The package includes the power bank and safety documentation.

How it compares

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

Price $47.99
Pricier than about 73% 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

How do I start charging my phone with the built-in USB-C cable?

Pull out the integrated USB-C cable, plug it into your phone, and press the power button if charging does not begin automatically.

When will the 20000mAh lithium-polymer battery need replacement?

Expect 2–3 years of daily use before capacity drops below 80%; the supplier backs the unit with a 3-year care program.

What stops the 45W output during a long charging session?

The Smart Temperature Monitoring System reduces power once the internal cells reach their thermal limit to prevent overheating.

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