The description says "update" supports pass through charging. i cannot, however get anything to charge while the power bank, itself, is charging?

Yes it does, but there's a trick: You must first plug the cable to charge the battery pack, and second, press the power button until the display says 5V. This enables pass-through mode. Of course you can double-press the power button if you need to adjust the DC output if needed. Just remember that when you plug in the charging cable for the battery pack, it will immediately shut off the output until you turn it on again.

how does manufacturer come up 50000 mah ? what cell using ?

I believe that is at 3.7V, so 50,000mAh * 3.7V = 185 Wh.

Does it/ can it be used to change a Surface pro 4

Yes. It can charge Surface pro 4 which is 12v. DC output: 5V/8.4V/9V/12V 3A (max) 16V(16.5V)/20V(19V, 19.5V) 4.7A (max) But we don't include this adapter. You need to buy an adapter or a cable by youself. Thank you. Have a nice day!

Pretty sure this cannot be checked in a aircraft baggage. Kindly clarify if this is allowed as a hand luggage on an airplane provided its power?

Dear customer, this power bank is 185Wh and you cannot take it on plane, even a hand luggage. You can buy Krisdonia 25000mAh which can be taken on plane. Thank you. Have a good one.

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50000mAh Laptop Power Bank 5/9/12/16/19/20V Portable Laptop Battery Charger with QC3.0 USB-A Port & 12V Type-C Port for Laptop, Tablet, Smartphone and More Devices

Product ID: 46813009

Details

Battery Capacity
50000 Milliamp
Brand
Krisdonia
Color
black
Connector Type
USB Type A USB
Special Feature
Portable

⚡QC3.0 fast charging USB ports

🔋50000mAh ultra-high capacity

🔌Adjustable 5-20V DC output

$277.56

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power your hustle anywhere, anytime—because running out is not an option!

RUGGED RELIABLE - UL-certified Li-Polymer battery with 6 safety protections and 1000+ recharge cycles—trusted backup for your on-the-go lifestyle.
PASS THROUGH POWER - Simultaneously charge the power bank and your devices—stay powered up without downtime.
CUSTOM VOLTAGE CONTROL - Adjustable DC output from 5V to 20V with easy voltage setting—charge laptops directly without bulky chargers.
POWER THROUGH YOUR DAY - Massive 50000mAh capacity powers laptops 2.5x & smartphones up to 18x—never run out during critical moments.
FAST FLEXIBLE CHARGING - Dual QC3.0 USB-A ports plus a 12V Type-C port deliver rapid, versatile charging for all your devices.

The Krisdonia 50000mAh Laptop Power Bank is a portable powerhouse designed for professionals on the move. Featuring adjustable DC output (5-20V), dual QC3.0 USB-A ports, and a 12V Type-C port, it supports fast charging for laptops, tablets, and smartphones. Its pass-through charging lets you power devices while recharging itself. Built with UL-certified Li-Polymer cells and multiple safety protections, it offers reliable, long-lasting performance with over 1000 recharge cycles. Compact and lightweight, it fits easily in your bag, ensuring you stay connected during critical moments.

Specifications

ASIN	B074N1B15F
Amperage	3 Amps
Antenna Location	Gaming Console
Battery Capacity	50000 Milliamp Hours
Battery Cell Type	Lithium Polymer
Battery Charge Time	7 Hours
Battery Weight	850 Grams
Best Sellers Rank	#41,684 in Cell Phones & Accessories ( See Top 100 in Cell Phones & Accessories ) #930 in Cell Phone Portable Power Banks
Brand	Krisdonia
Color	black
Compatible Devices	Laptop, Router, Smartphone, Tablet
Compatible Phone Models	All
Connector Type	USB Type A, USB Type C
Customer Reviews	4.2 out of 5 stars 890 Reviews
Item Dimensions	7.68 x 5.91 x 1.1 inches
Item Dimensions L x W x Thickness	7.68"L x 5.91"W x 1.1"Th
Item Weight	1155 Grams
Manufacturer	Shenzhen Nejifu Technology Co.,Ltd
Mfr Part Number	NJF-5X
Model Number	NJF-5X
Number of Batteries	1 Lithium Polymer batteries required. (included)
Number of Ports	4
Other Special Features of the Product	Portable, Wireless Charging
Reusability	Rechargeable
Special Feature	Portable, Wireless Charging
UPC	613852009215
Unit Count	1 Count
Voltage	12 Volts
Warranty Type	Limited

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