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Black rectangular power bank with built-in cables visible on sides

charmast C2065 20000mAh power bank 22.5W built-in cables

SKU CH-0535-GFQEJ MPN C2065

A 20000mAh lithium-polymer power bank with built-in USB-C, Lightning and Micro-USB cables, a digital percentage display and 22.5W fast-charging output

  • Total capacity20,000 mAh
  • Battery chemistryLithium polymer
  • Voltage9 V DC
  • Amperage2 A
  • Output typeFor iPhone, Android, Micro
  • InputFor iPhone, Android, Micro
  • 20000 mAh capacity delivers multiple phone charges
  • Built-in USB-C, Lightning and Micro-USB cables remove need to carry separate cords
  • 5 W output provides 50 % charge in 30 minutes
  • Digital display shows exact remaining power from 0 to 100 %
  • Six simultaneous outputs charge phone, tablet, earbuds and watch together

20000 mAh portable charger with built-in cables

The Charmast C2065 stores 20000 milliampere-hours of lithium-polymer capacity and integrates USB-C, Lightning and Micro-USB cables so nothing extra needs packing. It suits travellers, commuters and anyone who wants one brick that can top up a phone three to four times without hunting for cords.

22.5 W fast charging and digital percentage display

The bank delivers up to 22.5 watts through its USB-C cable, reaching roughly 50 percent on a compatible handset in 30 minutes. A numeric readout shows remaining energy from 0 to 100 percent, removing the guesswork of four-LED indicators during extended use.

Six simultaneous outputs and dual recharge paths

Three built-in cables plus two USB-A ports and a USB-C port allow six devices to draw power at once. The unit itself refills in about six hours via the USB-C input or twelve hours through the attached USB-A cord, so it can be ready overnight or between flights.

How it compares

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

Price $58.99
Pricier than about 86% of the 1,307 comparable items (median $36.99).

Specifications

Product
Brand nameCharmast
Model nameC2065
Part numberC2065-BLACK-AU
Total capacity20,000 mAh
Product type20,000 mAh
Product colorBlack
Ports & slots
Output typeFor iPhone, Android, Micro
InputFor iPhone, Android, Micro
Power
Battery chemistryLithium polymer
Voltage9 V DC
Amperage2 A
Size & build
Measurements16.0 in × 7.3 in × 1.9 in
Product weight340 g

Questions about this item

How do I start charging my phone using the built-in Lightning cable on the charmast C2065?

Pull out the integrated Lightning cable, plug it into your iPhone, then press the power button once; the digital display will show the exact percentage while the cable delivers up to 9 V 2.22 A.

What recharging method restores the 20000mAh capacity fastest for the charmast C2065?

Use the built-in USB-C input with an 18 W or higher charger; the unit reaches full charge in about 6 hours compared with 12 hours via the built-in USB-A port.

Which output hits its current ceiling first when the charmast C2065 powers multiple devices continuously?

The Micro-USB cable output is limited to 5 V 2.4 A, so it reaches its maximum before the USB-C cable (9 V 2.22 A) or USB-A 2 port (12 V 1.5 A).

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