Charmast C2065 20,000mAh Power Bank, 22.5W

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Product guide

Charmast C2065 20,000mAh Power Bank, 22.5W

Charmast C2065 is a 20,000mAh portable power bank with four built-in cables, a digital display and a claimed maximum output of 22.5W. Its integrated leads reduce the need to carry separate cables, while the listed 340g weight and multiple dimensions are worth considering if pocketability is a priority.

At a glance

Four built-in cables and four additional ports are listed. The feature copy claims charging up to six devices at once.
A digital display is claimed to show remaining charge as a percentage.
The manufacturer claims up to 22.5W output, with fast-charging support depending on the cable, port and compatible device.
The listing says to enable low-current mode for headphones and watches.

Price

£22.09Save 15%

Reference price: ~~£25.99~~

Price checked: 14 Nov 2026

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Often bought together

Charmast 22.5W Fast Charging Power Bank, 4 Cables Portable Charger 20000mAh | USB C Battery Pack, 6 Outputs 4 Inputs Powerban

Pros and cons

Pros

Four integrated cable types can reduce the need to carry separate charging leads.
The claimed 20,000mAh capacity and multi-device connections suit longer days or charging several gadgets.
The digital percentage display gives a more detailed charge indication than a simple multi-dot gauge.

Cons

At the listed 340g, it may feel bulky for buyers prioritising a light, pocket-sized charger.
The product information says it is not suitable for charging laptops.

Technical specifications

16 specifications

Identity
Brand	charmast
Model	C2065

Power and battery
Capacity	20000 Milliamp Hours
Maximum output power	22.5W
Voltage	9 Volts (DC)
Power configuration	Corded Electric
Cell type	Lithium Polymer
Rechargeable	Rechargeable

Connections and features
Cables and ports	4 Built-in Cables:USB-C,for iPhone,Micro USB,USB-A, 4 Ports:USB-C1+USB-A 2+Micro USB *1
Number of ports	4
Features	Built In Cable, Digital Display, Fast Charging, Over Charging Protection, Short Circuit Protection

Dimensions and physical details
Colour	Blue-20000mAh
Dimensions listed	16 x 7.2 x 1.9 centimetres
Weight listed	340 Grams
Additional dimensions listing	15.4L x 7.3W x 2.2Th centimetres
Battery weight	334 Grams

What to know before buying

The manufacturer says small devices such as headphones and watches need low-current mode. It also says the bank may become warm during use and advises stopping use if temperature exceeds 45°C.
The manufacturer says to carry it in cabin baggage and not checked baggage. Its stated phone charge count depends on device and usage, and delivered capacity is lower than the nominal battery capacity due to conversion losses.

Listing details to confirm

Listing details are inconsistent: the title and specifications state four ports, the connector description gives a four-port layout, while feature copy calls the four built-in cables plus four extra ports a total of eight connections and claims six devices can charge at once. Dimensions are listed as both 16 x 7.2 x 1.9 centimetres and 15.4L x 7.3W x 2.2Th centimetres, and the overall and battery weights differ. Confirm the selected version and connection layout before buying.

What’s in the box

Included

Power adapter ×1
Travel pouch ×1
User manual ×1

Who is it for?

A good fit for

People who want charging cables integrated into a multi-device power bank.
Travellers or commuters who prefer a digital remaining-charge display and higher stated capacity.
Buyers charging phones and small personal devices rather than laptops.

Less suited to

Anyone seeking a very light or compact pocket charger.
Anyone who needs a power bank for laptop charging.
Buyers who need a firmly established port count or exact dimensions without first confirming the selected listing.

Charmast C2065 20,000mAh Power Bank, 22.5W · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 5,188 ratings

5 stars74%74%
4 stars12%12%
3 stars5%5%
2 stars2%2%
1 star7%7%

Customer feedback highlights convenience from the built-in cables and the ability to charge multiple devices. Reports on portability are mixed, which matters for a unit listed at 340g, and charging speed receives both praise and criticism. Some customers say the bank holds its charge for weeks, while others report failure after around 200 days. These are reported experiences, not a guarantee of longevity or charging performance.

Positive themes

Customers appreciate the practicality of the built-in cables and describe the power bank as handy for carrying and charging multiple devices.

Negative themes

Some customers report that the unit broke after around 200 days.

Mixed feedback

Charging speed is described positively by some customers, while others say recharging the power bank itself takes a while.
Some customers find it convenient to carry, while others consider it too bulky for their intended use.
Battery life feedback varies, including reports of holding charge for weeks and reports of earlier failure.

Frequently asked questions

How many devices can the Charmast C2065 charge at once?

The listing describes four built-in cables and four extra ports, and claims charging up to six devices at once. Its connection counts are inconsistent, so confirm the actual layout for the selected version.

Can it charge a laptop?

No. The product information says it is not compatible with laptops and recommends a 30W-or-higher laptop charger instead.

Can it charge headphones or a smartwatch?

The manufacturer says small devices such as headphones and watches can be charged by enabling low-current mode.

What comes in the box?

The listed contents are one portable charger, one travel pouch and one user manual.