User Posts: japandude
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The Best External Power Banks for Gaming Laptops

The Problem: As more PC manufacturers (HP, Apple, Lenovo, etc.) shift to use of non-removable, sealed batteries in their laptops, you can no longer ...

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Aum Shinrikyo and the Subway Gas Attacks: Recollections from a Tokyo Resident

The nerve gas attack on the Tokyo subway by the religious cult Aum Shinrikyo on March 20, 1995 shocked Japan and the world. As a Tokyo resident at that time, ...

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Closing the Learning Gap with Asia: A Strategy for Top Students in the U.S.

U.S. Lags Far Behind Asia in Math and Science Education The U.S. lags behind China, Singapore, Japan, and South Korea in its level of math and ...

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The Best Portable/Foldable Solar Panels

Purpose Ideal for the occasional solar panel user, portable (foldable) solar panels can be stored in a compact space and pulled out only when needed. ...

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The Best Portable Solar Generators/Power Stations

Good at Many Things, Great at None Known by various names — portable solar generators, portable power stations, portable generators, power banks — ...

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The Best Power Banks for Small Laptops/Chromebooks

Do you run out of power when using your small laptop or chromebook when you're on the road? Although you can use one of the large power banks for gaming ...

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Cool Japanese T-shirts for Japanophiles

Don't Just Be Cool -- Be Kakkoii (格好いい) with Your Japanese T-shirts! Just as past fashion trends may look weird and even laughable today, sometimes that ...

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Online Asian Supermarkets – Amazon vs Weee!

Weee! vs. Amazon Weee! is a major Asian and Hispanic e-grocer that offers more than 15,000 products with shipping across the continental U.S. They have ...

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Martin Armstrong — The Guru for Amateur Investors

I consider myself an amateur investor. For 20+ years, I have been constantly looking for the best sources of authoritative information and guidance. Over ...

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Disaster Preparedness: Lessons from Japan

Intended Audience Although I am not a professional in disaster preparedness, I have experienced a number of disasters in Japan and the USA over 30+ ...

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Translatable Jokes

As a parent of children whose native language is not English, I had trouble sharing some of the most amusing and entertaining jokes and riddles that I ...

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Absurdist Jokes / Nonsense Jokes / Anti-Jokes / Non-sequitur Jokes

My favorite nonsense jokes from middle school: If there are 10,000 stars in the sky, how many pancakes does it take to paint a doghouse purple? Answer: ...

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Browsing All Comments By: japandude
  1. Here’s my opinion as a non-expert.
    Electronics are sensitive to changes in voltage, such as when a 100V device is plugged into a 240V outlet, but the power brick for your laptop probably is an international product that can handle 100V to 240V (mine says “INPUT: 100-240V ~3.5A”).
    And so, what will happen if you can only give your laptop 200W when it needs 230W (peak)?
    In my experience, such as when riding on planes with a supplied outlet (probably max. 120W), my laptop simply switched to battery power when it did not get enough juice.
    Also, the 200W power bank has a peak of 250W, and so it MIGHT be able to handle 230W for a short length of time.

  2. Thanks for visiting my site!
    It sounds like you’re going to need a lot of power.
    First, do you want your power bank to be portable (fit in a backpack) or can it be a bigger size? I review some of the large power stations here (http://www.japandude.com/guide-to-portable-solar-generators-power-stations/).
    To get an idea of how much power you need, try to figure out how many watts you’re using. You might be able to find out from the device manual, otherwise, you’ll need an “energy consumption meter” or similar device. I’ve seen them for $12-$13 on Amazon.(https://amzn.to/2pwHVjC)
    Then, you need to compare that value with how much juice the power bank will provide. From the manual (http://www.japandude.com/wp-content/uploads/2017/10/Portable-Solar-Generator-42000-mah-Manual.pdf), the 42000 mAh power bank above is 146 wH. That means that if you’re using 100W, you should get less than 90 minutes or power. If you’re using 50 W, you should get almost 3 hours. Of course, actual performance will slightly less than this theoretical value. This should at least give you an idea of what mAh (wH) range you should be looking for.
    Good luck!

  3. On the Amazon page of the Powkey power bank presented here, the manufacturer answers this question in the Customer Q&As: “The DC & USB outputs will auto off in several seconds if no devices loaded. but even a very small load, such as 2W USB fan, It will also be detected and the battery will always output power.”
    If size is not an issue, for this 300W peak / 280Wh capacity large power bank, in the Customer Q&As, the manufacturer says: “This portable power station will power down automatically if the total output power is detected lower than 2W for 12 consecutive hours. But if you charge the device less than 2W, this power station won’t stop working until 12 hours later.”
    Hope this helps!

  4. No problem!
    To help the others here, feel free to post feedback on how the device worked for you. ☺️

  5. Because power capacity is more important to you than portability, it sounds like you need a “portable power station” instead of an external power bank.
    My regular pick of the Gensrock Portable Power Station, which features 222 Wh power capacity, may just run out of power at the 2-3 hour mark.
    If price is not an issue, you should look at my upgrade pick of the EF ECOFLOW Portable Power Station RIVER 2 Pro, which features a 768 Wh power capacity.
    Another option that offers more power capacity than my regular pick but is not so pricey is the EnginStar Portable Power Station. It features 296 Wh power capacity and should be just enough to get you over the 3 hour mark. Good luck!

  6. On the Amazon page of the Powkey power bank presented here, the manufacturer answers this question in the Customer Q&As: “The DC & USB outputs will auto off in several seconds if no devices loaded. but even a very small load, such as 2W USB fan, It will also be detected and the battery will always output power.”
    If size is not an issue, for this 300W peak / 280Wh capacity large power bank, in the Customer Q&As, the manufacturer says: “This portable power station will power down automatically if the total output power is detected lower than 2W for 12 consecutive hours. But if you charge the device less than 2W, this power station won’t stop working until 12 hours later.”
    Hope this helps!

  7. Technically, it’s difficult to say, but if I had to guess, I’d say yes. That’s because I was able to charge my 230W laptop with a 90W power bank when it was turned off.
    Of course, there’s no guarantee, and so maybe you should buy the 100W power bank from a dealer with an easy return policy just in case.
    The reason it could work is that 200W is the maximum power that your laptop draws, but normally, it should not need that much power.

  8. The best thing is to just check with the airline that you will be flying with. Many have it posted on their websites.

  9. This power bank provides up to 100W of power and should be OK for air travel.
    Link:
    https://amzn.to/3B80k6e

  10. In that case, the 64800 mAH power bank (220 Wh) would be your best choice because it offers 300W power output (600W peak).
    The next closest is the 42000 mAh power bank, but it only offers 200W power output (250W peak).
    If you still don’t think that these will give you enough power, you need to look at the power stations that I review here.
    The large power station there provides 1000W power (2000W peak).

  11. Your device does NOT need to be in sleep mode or turned off.
    The 42000 mAh power bank can provide power continuously at 200W (250W peak). That means that you CAN run your PC while charging — the PC will act like it’s plugged into an outlet. In fact, I was able to run my 230W power laptop this way.
    In my experience, the PC would need to be off only when the power bank cannot supply enough power in its normal state — such as when using the 50000 mAh power bank that has only 90W power output.

  12. Thanks for your question!
    Because the 50000 mAH power bank featured here supports only up to 90W in the specs (we tested it working up to 120W), I think that the 42000 mAh is the best choice for you.
    It’s also the only one of these three that is TSA-approved for airline travel (carry-on) because it’s less than 160wh.

  13. BelgiumDude,
    I think that you’re misunderstanding the units of power, watts (W), here. You NEED to have a power bank that supplies at or more than your power needs.
    You can plug low-power devices into the 200W power bank without any problems. The 200W is how much power it supplies at the peak.
    When you plug in low-power devices, the power bank will last 8 or more hours. When you plug in a high-power device, it will only last for an hour or two.
    The AC output for the power bank is “AC 110V”. As long as your device can plug into outlets in North America (110V), you don’t need to worry about frying your device.

  14. Hey there!
    A powerbank of +- 150W will PROBABLY be OK unless you are running games or other high-demand apps.
    Normally, my PC runs at only a fraction of the maximum power.
    However, 60Wh seems a little small to me. If your PC runs at about a third of the maximum power (170/3 = 57W), that will only give you one hour of power.
    The 42000mAh (146Wh) power bank featured here will give you 146 Wh, which is almost 2.5x more than 60Wh.
    Of course, it all depends on what you need it for. I hope that this helps!

  15. I have the 42000mah power bank, and for my 230w gaming laptop, it gives me about 2 hours of power — longer when using light apps, shorter for games and other power-intensive apps.
    Based on those numbers, the 64800mah power bank should give you around 3 hours of power.
    I hope that this helps!

  16. Thanks for the kind words.
    It sounds like you need a “power inverter” for your car that plugs into the cigarette outlet. Plus, you’d want one that’s rated HIGHER than 180W.
    Here are some power inverters.
    https://amzn.to/2SE8Oht

    JapanDude

  17. It’s difficult to give a reliable estimate with all the possible variables, but here’s some estimates for you.
    The 64800mah is equivalent to 220 Wh, and the 6-cell battery in the XPS 9550 is rated at 84 Wh, and so that’s nearly three times as much as the current battery.
    Your power supply is rated at 130W, and so when running at FULL power, you should get around 220/130 = 1.7 hours.

  18. Off the top of my head, I’d say slightly more than two hours for word processing applications. Of course, this would be significantly less for games.

  19. That’s right. You can’t charge it (connect to the INPUT) and use power (connected to outlet or USB) at the same time.

  20. That’s right. You can’t charge it (connect to the INPUT) and use power (connected to outlet or USB) at the same time.

JapanDude
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