You need to look no further for a reliable 5 STARS power bank.
I own a 17” ASUS G750-JM with an intel i7 quad core and Geforce 860m GTX. In of electricity consumption, my laptop is definitely power hungry. I have all 4 ram slots full and 2 hard drives installed.
Before purchasing the K2 power bank I had purchased another power bank but had to return it because it could not power my laptop, not even when off.
With the K2 I was able to get almost 9 hours of power on standby only. Screen saver was off to prevent the screen from turning off. Yes, the power bank kept my huge laptop on for almost 9 hours on standby (not using the computer). This test was performed to figure out how long the laptop could be powered by the K2.
I got 6 hours of power under normal laptop usage, I was even able to watch a dvd movie for about 2 hours and still had more than half the power left to do some work and mess around. I should mention that I had an external mouse and keyboard plugged in the USB slots during both tests, and even though the power consumption from these peripherals is minimal, it is something to keep in mind regarding the tests I ran, since in a real life scenario on an airplane for instance, the keyboard and the mouse will not be plugged in, therefore increasing the overall power left from the K2.
Keep in mind that both tests were performed using the “high performance” power profile in windows 7. If I wanted to be more conservative, I could have lowered the screen brightness all the way down, turn off the laptop’s keyboard backlight, and put the power profile on “power saver” which overall could have given me a few more hours of juice in both tests, but since I almost never use the power saver windows profile, I thought I would use it under more realistic circumstances that apply to me on a daily basis. The K2 performed fantastic!
Things you need to know and consider: The battery will not change my laptop when I am using it. That is because my laptop is a power hungry one (this will probably not apply to your laptop). I have no problem with that because honestly all I want is to be able to use it on the go. So if you own a power hungry laptop like mine, make sure your laptop’s battery is charged all the way before using it, so that the K2 will hold the charge at 100% for 6 or more hours until the K2 discharges completely, then when that happens you can continue to use your laptop’s battery for as long that one will last. If your laptop is a power hungry one and you wanted your laptop’s battery to be charged by the K2, you can do so if you turn off the laptop. In that case the K2 will be able to recharge the battery of your laptop. So, charging the laptop’s battery is an issue only if the laptop is on, but if you do not have a power hungry laptop like mine, you will sure be able to use your laptop while simultaneously charging its battery if it was discharged.
This honestly does not bother me because like I said, what matters to me is being able to use my power hungry laptop on the go, which so far other power banks simply have not been able to do.
I’ve read the reviews for power banks of other brands out there and they all scared me honestly. I read the reviews for the K2 and I was convinced I could try it with confidence, and boy… I am glad I trusted them!
This is exactly what I was looking for. I am really looking forward to trying the K2 during my next international flight and probably being the only one in the plane with the laptop on during the entire flight.
All USB ports worked fine. The unit looks really high quality. It’s a bit on the heavier side but listen: we are talking about quality here not something made out of cheap plastic, the unit looks and feels very durable. It can be fully charged over 1000 times. That’s a lot of times… to give you an idea, there are 365 days in a year. Are you going to be using the K2 every day? Very likely not! And if you would, you could do it for about 3 years. That’s a lot of time. Batteries degrade over time whether you use them or not, so more realistically this unit will last me 5 years maybe more, which is plenty of time for me. The original battery from an iphone 3GS lasted me 6 years (it recently died), and that was because I gave it good maintenance. If you plan on having the battery of your devices or power banks last as long as they possibly can, I recommend you to inform yourself about the type of battery your electronic device is using and learn the best practices to maintain the quality and extend the life of your battery. All the batteries of the laptops I have used have lasted me very long because I always gave them great maintenance.
I found on youtube what seems to be an official video of the K2, check it out: [...]
The customer for the K2 is among the best I’ve ever ran into. The unit came with a free gift which was another smaller power bank for smartphones and tablet. I thought that was nice. It turned out the small power bank was defective and so I corresponded through amazon with the K2’s customer . Minutes later I received an email telling me that I was going to get a new small power bank (replacing the free gift) at no cost to me. The person I corresponded to was incredibly friendly and kind. Help was offered to me in case I had difficulties using the K2.
Customer so efficient is what unfortunately you almost NEVER run into on amazon. I can’t even mention the amount of times that sneaky amazon resellers have tried to scam the crap out of me, and have made almost impossible returns of cheap $2 purchases. Shame on them for being such beggars.
This is not an issue you will run into with this company. You can buy with confidence.
This product is a great purchase at this price. It’s a 50000mah power bank and you are not gonna find another one at this price. Read the reviews! Not only for the K2, but for the other power banks as well. Look for 1 star on amazon and really ask yourself if you want to go through what other people have gone through with other brands. I don’t know about you, but I don’t like to waste my time and do trial and error or hope that I am the lucky one. I like to go with what works. If you are paying less, you are gonna get less. Before purchasing the K2 I thought I could save money buying another power bank, I did it and I wasted my time. After that I went back to the K2. I should have purchased it the first time, but oh well, another lesson learned…
Thank you to the people at the MAXOAK for the very fast given to me and for their kindness. It honestly took me longer to write my review than it took them to answer my inquiry, but I hope this review can help other customers not go through the hassle I experienced before buying the K2.
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Product Description
Tips:
Low shutdown current for 5V port:70mA
Low shutdown current for 12V port:150mA
Low shutdown current for 20V port:200mA
High shutdown current for 20V port:>7A
If your laptop turn off automatically for several seconds or minutes, it may caused by overcurrent/lowcurrent protection.
if automatic turn off is caused by overcurrent protection,Please close the screen of your laptop or fully charged your laptop first, and then use our power bank to charge the laptop.if you are trying to power a Windows laptop and the battery keeps disconnecting over and over, you might have to go into Power settings, Advance power settings, and find the setting for "Turn Harddrive off after" and set that to NEVER, and in power options DISABLER "Intel pc Energy Saving"
How Can I Know Whether My Laptop Will Cause Power Bank Overcurrent or not?
Please Check the label pasted on the adapter, if it is more than 130W (DC output current is more than 7A). it may cause our power bank turn off during charging for overcurrent. so we do not suggest to use our power bank to charge your laptop.
Laptop Power Bank
Tips/Attention:
It is 185Wh,exceed Max.160wh flight limits, can not allowed to take on airplane.
- Cann't charge Surface Pro 4( if DC voltage is 15V) ,but Can charge surface pro 4 ( if the DC output voltage is 12V) ,Can charge Surface Pro 3(but need buy DC5.5*2.1mm to surface pro cable yourself)
- Cann’t charge Lenovo Yoga 3 14, yoga 900(20V 3.21A), yoga 3 11 13 milx 4 700s(20v 2a)
- Cann’t charge dell xps 12(Type C) and other type-C laptop
- Cann't charge Macbook/Macbook air/Macbook Pro
- Cann't be recharged by solar /car charger
50000mAh/185Wh Laptop Power Bank
All-in-One Power Bank
Portable Power Station for indoor or outdoor use .Compact and lightweight potable laptop charger featured with one DC20V5A (max.130W) ,one DC12V2.5A and Four 5V USB outputs, provide off-grid power backup for emergency power failure while engaged in outdoor working and outdoor exploring life.We work and play on on our laptop, take laptop on camping trip or travel.no one wants to be caught out there with no power, this is why a good portable laptop power bank is critical and useful.
- Ultra High Capacity 50000mAh Once Fully Charged, Our K2 Portable Battery Pack Can Charge Your iPhone 6 Plus about 11 Times, iPhone 6 About 17 Times, Galaxy S6 Almost 11 Times.
- The widest compatible Laptop Power Bank Total 14 kinds of connectors are supplied to assure a maximum compatibility with a wide range of popular laptops notebooks.
- All in One Charge-it has 6 outputs for different digital devices. One 20V/5A, one 12V/2.5A, two 5V/2.1A and two 5V/1A output allow you charge several devices like laptop, tablet, phone simultaneously.
- Recharge the power bank in 6-8Hrs
- charge and discharge at the same time
- Built in multi-protection function including overload protection, over-current, low-current protection,etc.
- The First Power Bank Specially Designed for Laptop/Notebook
- UL Certificated, UL1642 for battery cell and UL2056 for power bank.safety is gurranted and quality is rest assured.
Portable and Easy to Carry
Weight:2.77lb (1.26kg)
Dimension: 8.1"in x 5.3"in x 1.3"in (LxWxH)
20.6cm x 13.5cm x 3.3 cm (LxWxH)
it is built in 8pcs 6250mAh lithium-ion polymer battery cells,size as a book,it is real 50000mAh, so it is impossible to be very lightweight and small size as lower capacity power bank, pls check the size and weight carefully ahead.
High Quality&Safe Gurranted
We take quality, safety as the most important thing.we built in high quality lithium-ion polymer battery cell certifacted with UL1642 and whole power bank certificated with UL2056.
We have strict material inspection and production supervision and testing process, ensuring the highest quality,safety, reliability and performance.
What You Can Get
Laptop power bank(K2) x 1
AC adapter charger x 1
DC cable x 1
Laptop charge connector x 14
Multifunction bag x 1
Manual x 1
500Wh/300W
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1500wh/1000W
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2400wh/1000W
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EB240+2PCS*SP120
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AC200P+3PCS*SP120
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500Wh/300W
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| AC Load | Continuous 300W | Continuous 1000W | Continuous 1000W | Continuous 1000W | Continuous 2000W | Continuous 300W |
| Outputs | 2*AC120V,2x 12V/3A, 12V Car Port,1x45W USB-C, 4x 5V 3A USB | 2*AC110V,2x12V/3A,12V Car Port,1xQC3.0 USB(Max.18W),1x USB-C(Max.40W),1x 5V/2.4A USB | 2*AC110V,2x12V/3A,12V Car Port,1xQC3.0 USB(Max.18W),1x USB-C(Max.40W),1x 5V/2.4A USB | 2*AC110V,2x12V/3A,12V Car Port,1xQC3.0 USB(Max.18W),1x USB-C(Max.40W),1x 5V/2.4A USB | 6*AC outlets,1xDC12V/25A,1xDC12V/10A,2xDC 12V/3A,1x60W USB-C,4x5V/3A USB-A, | 2*AC120V,2x 12V/3A, 12V Car Port,1x45W USB-C, 4x 5V 3A USB |
| Recharge way | AC/Solar/Car/Generator | AC/Solar/Generator | AC/Solar/Generator | AC/Solar/Generator | AC/Solar/Car/Generator/Lead-acid battery | AC/Solar/Car/Generator |
| Solar Input | OCV 14-40V/Max.120W/Max.10A | OCV16-68V/Max.500W/Max.10A | OCV16-68V/Max.500W/Max.10A | OCV16-68V/Max.500W/Max.10A | OCV35-150V/Max.700w, Max.12A | OCV 14-40V/Max.120W/Max.10A |
| Weight and Size | 13.6lbs,11.6*7.5*7.7inch | 37.9lbs,14.6*6.5*14.4inch | 48.5lbs,19.4*6.5*14.4inch | 48.5lbs,19.4*6.5*14.4inch | 60.6lbs,16.5*11*15.2inch | 13.6lbs,11.6*7.5*7.7inch |
From the brand
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With over 10 years of experience in the energy storage industry,years of hard work and the accumulation of customers, BLUETTI products are now loved by over 500,000 s worldwide. And BLUETTI will keep bringing more high-performance clean energy,professional, stable and reliable power storage products to the world.
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Power All Your Needs
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Just Power On
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Life in the Convergence Zone
The Kayo Maxtar K2 is one powerful device as well as a near-essential for life in the convergence zone where the weather is always unpredictable during the Fall and Winter months. "Expect the unexpected" and you will never be disappointed.. Preparation is everything.. Each year about this time we restock batteries, check lanterns and flashlights, test our generator, make certain our potable water containers are handy, and check off myriad other tasks that by now have become our seasonal routine. New to us this year is the Kayo Maxtar K2. With its 4 USB ports, a 12v as well as a 20v port, and its 50,000 mAh the K2 is an elegant and beautifully designed device. We can easily keep 4 phones charged and ready-to-go wherever we are -- however remote. The K2 is no lightweight however, and I've found that it fits perfectly in the front zippered pocket of my trusty Victorinox daypack, a pack that I take nearly everywhere -- whether out in the back pastures of our sheep farm or tucked behind the driver's seat whilst out and about or stowed along with our family's other packs and carry-alls while on a longer trip across the mountains and high-desert. All the places where we will be glad to have the K2 so charging capabilities are with us wherever we are. Peace of mind, in other words. I have not yet used the other ports, but know we will. I was pleased to learn that a K3 is in the works that sounds as though it will be just the thing to keep our various MacBooks, MacBook Pros, and iPad chugging along just as easily as the K2 handles our iPhones. I've found customer service from Kayo Maxtar to be beyond exceptional. The day before our K2 was scheduled to arrive I received an email from Zola asking me to please let him know when our package arrived to reassure him that it was indeed the device we'd ordered. When our package arrived the following day, I opened it promptly and was able to reassure Zola that all was as it should be and that the K2 and all its accessories where safely tucked inside. That night I tested the K2 by charging all our phones and found that the device performed perfectly. Zola has been phenomenal, checking back with me regularly to be sure we are happy with our K2 as well as answering several technical questions I had regarding whether or not the K2's 12v would be capable of powering my Hansen e-Spinner (a beautifully-crafted portable spinning wheel). After checking with his technical team, it seems as though the K2 is not a good choice for this purpose. But in of keeping our phones charged at all times, regardless of power outages and other inconveniences that no doubt lay in wait during the Fall and Winter months to come, I have no doubt whatsoever that our family is in great hands with the K2.
Top reviews from the United States
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Reviewed in the United States on March 20, 2016Amazon Customer
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Reviewed in the United States on November 12, 2020
Top reviews from other countries
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Nicholas GreenReviewed in Canada on August 6, 2020
Great price for charging capacity
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GPReviewed in Canada on August 7, 2020
Very HIGH Capacity Power Bank with serious limitations
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