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Well I am 24 and this is my first time travelling overseas. Kind of embarrassed, but I finally have enough money for travelling.
I would like to ask can I take this 30000mAh Power Bank, onboard the plane? Most of the time I will not be at the hotel, hence why I need a larger powerbank.
Their website, which you link to, has this FAQ
Can you take portable chargers on planes?
Most airlines allow lithium batteries that do not exceed 100W/hours in the carry-on luggage. You can find the product specific information on the outside of the power bank. Also, consult your airlines for specific information about your flight and travel locations as there may be different regulations between airlines.
According to publicly available images of the product, and by the correct calculations in the other answers, Capacity of this power bank is 111Wh.
This product might not be allowed on an airplane without the approval of the airline. Obviously the exact answer will depend upon what do they decide at that time, and it's hard to give a definitive answer.
Please see IATA guideliness kindly shared by @jcaron.
* Before someone comes along saying carry-on prohibition doesn't mean they can't have them in checked baggage; please note that loose lithium batteries are generally never allowed in checked baggage regardless of their capacity.
Bonus Tip since you're a new traveler.
Be nice to the staff you will interact with in due course, and no one will probably care about that battery pack and will let you board with it :) (It's not too far above the limit)
And whether you have the battery pack or not, whether you have a lot of money or not, just enjoy your trips. You aren't answerable to anybody as to what took you so long to travel for the first time.
From the IATA guidelines, all lithium batteries are subject to regulation, with specific rules depending on the type of device (portable electronic-device, medical device or spare battery).
A power banks is considered a spare battery (not a portable electronic device) and are restricted to carry-on luggage only (i.e. prohibited in checked luggage) and further restricted based on its capacity rating :
To avoid any issue, you should target a power bank with a capacity rating below the 100Wh threshold, even if that implies to take two of them.
If the energy capacity (in watt-hour) of the power bank is not specified in the product sheet, it can be deduced from the charge capacity (in ampere-hour or milliampere-hour) and the nominal voltage with the following formula : 1 Wh = 1V x 1Ah. But note that the electric charge of a power bank is not given relative to the output voltage (which may vary) but to the nominal voltage of the li-ion battery pack inside which is usually a bunch of 3.6V or 3.7V 18650 cells in series.
Your 30 000 mAh power bank would have a capacity around 110Wh (30 Ah x 3,6-3,7 V) depending on the cell type. Power banks designed for airplane carry are around 27 000 mAh to fit the 100Wh restriction and the capacity (usually 99,xWh) should be specified in the product sheet and written on the enclosure to avoid any issue.
The "Aukey" power bank PB-Y3 does not appear to have a Wh rating marked on the outside of the case, based on studying a Russian review video.
The typical airline 100Wh limit could be considered to be exceeded then, by the airport security personnel since 3.7V * 30,000 = 111Wh. I have seen them take power banks away from people (in Asia- US security seems to be more lax in that regard).
For what it's worth (from a teardown video) the internals contain 3 pyramidal cells marked 3.7V 10000mAh so the rating is as honest as the Chinese battery maker (BTC, apparently). I suspect it's somewhat- "optimistic" in this case, but that's just my opinion (based on seeing a lot of other dubious claims- and a case of BTC batteries I was gifted because they didn't meet specifications).
Personally I would get a Huawei or Xiaomi 20,000mAh power bank rather than this one, if it was available off the shelf. They're brand-name cell phone makers (so they definitely know batteries) and have good reputations for quality and safety. I have hiked as long as 13 hours using an iPhoneX running mapping applications using the phone and an alleged 11,000mAh power bank (low power mode on the phone much of the time). There was plenty of juice left in the power bank if I got a chance to charge it mostly. It takes quite some time (as much as 9 or 10 hours) to charge some of the power banks, and you probably want them close by while charging.
Keep in mind, the higher capacity power banks are significantly heavier and you have to lug all that weight around or nothing. There are often opportunities to charge your phone at restaurants, cafes, workplaces etc. and unless you're doing a lot of video work or obsessively playing with your phone you may not use that much juice. However, mapping applications do tend to use a lot of power- and, at least on my phone, they keep the screen on consuming even more power.
Safety wise, keep in mind that 111Wh is 400kJ of energy. A .45 ACP bullet carries 0.5 to 0.8kJ. A stick of dynamite is about 1000kJ.
Edit: For what it's worth, I just bought a Huawei 20,000mAh power bank myself, model CP22QC (CNY269) and it is clearly marked on the unit (where anyone inspecting can read it) as 68.97Wh, well under the 100Wh limit, so they are assuming an average lithium ion battery voltage over the discharge curve of 3.4485VDC. Note that there is a common (rather optimistic) misconception that the mAh ratings quoted apply to the output. The output will be less by the voltage ratio and even less than that because the DC-DC conversion process is not 100% efficient. At 85% efficiency you might get 11,500mAh from the output.
Note & tl;dr: I'm certainly not endorsing any particular brand, but I would suggest buying a major world-wide cell phone brand.
