Would it be possible to use this as a mini ups (uninterrupted power supply) so that it could stay permanently plugged and passing through power?

The XT-20000QC3 is not suitable as UPS.

Can this power devices on the 12v & usb outputs at the same time?

Yes. You can use the DC out and the USB out simultaneously. I use mine to provide extended power to a guitar pedal board. Using the USB to provide back up power to Pedaltrain Volto 3 ( the Volto retains virtually full charge while it is being supplied this way and also gives the 9v source for the pedals. The DC is set to 15v and goes direct to power a Shure wireless receiver / tuner. The battery is slim enough to fit under a Pedal train Nano like the Volto. Never used more than 20% for a 4hr session. One thing you have to ensure is that you don’t use it to power only a low draw device as it has an auto switch off when the draw is low enough. XT Power has a later version which doesn’t auto switch off. But never found this an issue in my use.

Could this power 2 roland boutique synths at the same time via the two usb ports?

You can simultaneously connect 2 devices to the USB outputs. The maximum output power of each output is 10W.

How many Watt/hours is this device? Ryanair only allows 160 w/h All calculators seem to be asking for the voltage, how do we do this calculation?

The XT-20000QC3 has a capacity of 73Wh. This capacity is also written on the back of the Powerbank. When calculating the capacity, the voltage refers to the internal cell voltage of the Powerbank. The internal cell voltage of the XT-20000QC3 is 3.6V. Calculation: 3.6V x 20100mA = 73Wh

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PowerBank 20000 mAh QC3-PA with Real-time Display LED Display - External Mobile Phone Batteries, High Capacity Power Bank with 65 W Power - Fast Charging for Laptop & Smartphone via USB & DC

PowerBank 20000 mAh QC3-PA with Real-time Display LED Display - External Mobile Phone Batteries, High Capacity Power Bank with 65 W Power - Fast Charging for Laptop & Smartphone via USB & DC

Product ID: 119159373

Details

Battery capacity
20100
Brand
XTPower
Connector type
Micro USB
Special feature
Fast Charging
Voltage
12 Volts 24

⚡65W max power output

🔋20100mAh high-capacity battery

🔌Multi-port: USB, USB QC3 & DC (5-24V)

¥37697

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Description

⚡ Stay powered, stay ahead — the ultimate powerbank for the modern professional.

RELIABLE READY - Backed by manufacturer guarantee and designed for fast recharge in just 3 hours — never miss a beat.
LIGHTWEIGHT PORTABLE - At just 400 grams, this sleek powerbank fits effortlessly into your professional on-the-go lifestyle.
VERSATILE CONNECTIVITY - Equipped with USB, USB QC3, and DC ports supporting 5-24V devices — perfect for all your tech essentials.
TURBOCHARGE YOUR WORKFLOW - 65W max output with Quick Charge 3.0 ensures lightning-fast charging for laptops, tablets, and smartphones.
POWER UP ANYWHERE ANYTIME - Massive 20100mAh capacity keeps your devices charged through long workdays and travel.

The XTPower XT-20000QC3 is a high-capacity 20100mAh lithium-ion powerbank featuring a 65W max output with Quick Charge 3.0 technology. It offers versatile charging options via USB, USB QC3, and DC ports supporting 5 to 24 volts, making it ideal for laptops, tablets, and smartphones. Compact and lightweight at 400 grams, it recharges fully in 3 hours and is designed for professionals needing reliable, fast, and portable power on the go.

Specifications

ASIN	B07Q29BGNG
Amperage	21 Amps
Antenna Location	Iphone,Laptop,Tablet
Battery Capacity	20100 milliamp_hours
Battery Cell Type	Lithium Ion
Battery Weight	40 Grams
Best Sellers Rank	1,799 in Mobile Phone Portable Power Banks
Brand Name	XTPower
Compatible Devices	Camera, Laptop, Smartphone, Tablet
Connector Type	Micro USB
Customer Reviews	4.4 4.4 out of 5 stars (214)
Item Dimensions	30 x 23 x 11 centimetres
Item Dimensions L x W x Thickness	30L x 23W x 11Th centimetres
Item Weight	940 Grams
Manufacturer	XTPower
Manufacturer Part Number	XT-20000QC3-PA
Model Name	galaxy
Model Number	XT-20000QC3-PA
Number of Batteries	1 AA batteries required.
Number of Items	1
Number of Ports	2
Other Special Features of the Product	Fast Charging
Output Current	1.8 Amps, 2 Amps, 2.1 Amps
Power Source	Corded Electric
Reusability	Rechargeable
Unit Count	1.0 count
Voltage	12 Volts, 24 Volts

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¥37697

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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