GrnOas.E K51-26-F 10,000mAh Power Bank with Built-In Cables

GrnOas.E K51-26-F is a 10,000mAh portable power bank with two built-in charging cables, USB-A and USB-C ports, and a digital battery display. Its integrated leads reduce the need to pack separate cables, while customer feedback is mixed on charging speed and reliability.

At a glance

Two built-in leads are described as an iPhone cable and a USB-C cable for Android-compatible devices.
The listing claims four device outputs, simultaneous charging for up to four devices, and two input options for recharging the bank.
A digital display shows remaining battery percentage, according to the listing.

Price

$13.49Save 10%

Reference price: ~~$14.99~~

Price checked: Nov 12, 2026

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Often bought together

Miady 2-Pack Portable Charger, Slim 10000mAh Power Bank Travel Battery Pack | Dual USB丨3 Outputs 2 Inputs丨for Backpack Travel Camping丨Slim丨Compatible with iPhone Android etc丨Flight-Safe丨37Wh丨Black+White

$21.99

Pros and cons

Pros

Built-in iPhone and USB-C cables can reduce the need to carry separate charging leads.
USB-A and USB-C ports add charging options beyond the integrated cables.
A percentage display makes the stated remaining charge easier to read than a basic indicator.

Technical specifications

15 specifications

Identity
Brand	GrnOas.E
Model	K51-26-F
Color	Pearl Black

Power and battery
Battery capacity	10000 milliamp_hours
Battery cell type	Lithium Polymer
Power configuration	Corded Electric
Listed voltage	5 volts
Battery quantity	1 Lithium Polymer batteries required. (included)

Ports and features
Connector types	USB Type A, USB Type C
Listed number of ports	3
Special features	Built In Cable, Digital Display, Fast Charging, Over Charging Protection, Short Circuit Protection
Compatible devices	Headphone, Smartphone, Smartwatch, Tablet

Dimensions and installation
Dimensions listed	5.9 x 2.7 x 0.75 inches
Weight listed	6.1 ounces

Other details
Warranty description	3 year warranty

What to know before buying

Listing details to confirm

Listing details are inconsistent: the listed port count is 3, while feature text claims four outputs and two inputs. Dimensions are given as 0.75 inches thick in the specifications and 0.72 inches in feature text, while weight is listed as both 6.1 and 8.4 ounces. The claimed charge rates vary by cable or port, so confirm the intended connection and output before buying.

Who is it for?

A good fit for

Travelers who want a compact backup battery with built-in iPhone and USB-C charging leads.
People charging a phone, tablet, headphones, or smartwatch who value a visible battery percentage.

Less suited to

Buyers who need a clearly confirmed port configuration or a dependable, unambiguous charging-rate specification.
Buyers who prioritize consistently reported charging speed or reliability, since customer feedback on both is mixed.

GrnOas.E K51-26-F 10,000mAh Power Bank with Built-In Cables · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 1,714 ratings

5 stars72%72%
4 stars10%10%
3 stars6%6%
2 stars2%2%
1 star10%10%

Customer feedback highlights convenient built-in cables and compact portability, with reports that it fits easily in a belt bag. Opinions are mixed on charging speed, reliability, and weight, including reports of slow charging or the unit stopping after initial use. The built-in leads suit buyers seeking fewer separate accessories, but feedback does not establish consistent charging performance or long-term reliability.

Positive themes

Customers appreciate the compact size, portability, built-in cables, and ease of use.

Mixed feedback

Charging speed and reliability receive mixed feedback, including reports of slow charging and of the unit stopping after initial use.
Weight opinions differ, with some finding it light and others considering it heavy.

Frequently asked questions

What cables are built into the GrnOas.E K51-26-F?

The listing describes two built-in cables, one for iPhone devices and one USB-C cable described as compatible with Android devices.

Can it charge more than one device at once?

The feature text claims four outputs and simultaneous charging for four devices. However, the specifications list three ports, so confirm the selected listing's actual output configuration.

How fast does it charge devices?

The listing gives different output claims for each cable and port: up to 22.5W for the USB-C cable, 12W for the iPhone cable, 20W for the USB-C port, and 18W for the USB-A port. These are listing claims, and the connection used matters.

Does the power bank show its remaining charge?

The listing says its digital display shows the remaining power as a percentage and can be switched off by pressing the power button twice.