MAXOAK Laptop Power Bank 185Wh/50000mAh(Max.130W) Portable Laptop Charger External Battery Pack for Laptop iPad Phone Notebook

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 terms 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 support 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 support. 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 support 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 feedback 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 support 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.

I received this power bank yesterday, with a nice little one included as the gift in the box, for charging my cell phone or other USB powered device on the go. After I received it, I plugged the 50000MAH one in and charged it for about three hours before determining it was completely charged. I disconnected it from the charger and connected it to my Sony VAIO VPCEG1BFX laptop using the supplied cable and correctly sized laptop connector. For anyone wishing to know the physical location of the 20V DC plug, it's the one furthest from the USB ports, but next to the 12V plug. The 12V and 20V plugs are identical, and the DC charging input plug is much smaller than both of them, along with being across from the USB ports and on the same edge.Just as expected, the battery began charging the laptop once I pressed the button to turn it on. I didn't do much on it, so expected it to last a long time. Given that the extended battery in it lasted me about nine hours doing this, and a 27000MAH battery with an AC outlet on it lasted me six hours, I thought it might last me ten. Even after some windows updates and reboots, not only did the battery charge the extended one from 96% to a full charge, but ran for about seventeen hours before dying. It has certainly exceeded my expectations. With my extended battery and this one, I won't need to use power inverters on those long twelve-hour road trips, especially if I'm not using wireless and am only listening to some audio. Given that the laptop was doing nothing, I estimate that if I were on it, it would last about ten hours, maybe nine if I was doing something extensive like watching video. And, of course, if you're fully charging the battery while using the laptop, it will cut the battery life down even more. Even so, it's quite impressive and I don't regret the purchase.All four USB ports work as well, and presumably, the 12V port would also work, though I don't have anything of that voltage to try it with. As a nice bonus, that little battery with its two USB ports charges, and I imagine it would also work very well, though haven't tested it quite yet. I am able to charge USB devices through the larger battery while it's charging, so that will cut down on me needing to bring any extra USB chargers with me, I'll only need the cables for my devices.The battery is fairly good sized and is heavy. It feels solid, and nothing rattles or is loose when moved. It comes with a nice soft carrying case, which fits the battery and its charger in the smaller zippered compartment, along with the DC cable for connecting laptops. I wouldn't recommend putting the charger in the small compartment, though, I'd put it in another place so you don't damage it or the case. If the fit wasn't quite so tight, or the transformer so thick, I'd feel a little more confident about using it in that way.All in all, I'm quite enjoying the battery, and am almost tempted to purchase another. My only wish is for a smaller battery that could charge my laptop in the same way this one does, so I could bring it on a flight with me. Since I don't go flying much, though, it's not a big issue, and that's what my other battery with its AC outlet could be used for, I suppose. It's not nearly as efficient, but I'll take what I can get.Great product, and fantastic service on answering the questions, too!