Most of the time I receive samples by courier 3 or 4 days after the company sends it, but sometimes I’m being sent devices over airmail which may take 2 to 3 weeks, or even more. Today, I received such a parcel with no clear description on the package, and a relatively heavy blank carton box.
But I remembered somebody told me they’d send a large power bank for laptops. Could it be it? Sure enough. The power bank is called MAXOAK K2, and claims to offer a 50,000 mAh capacity using a Polymer Li-on battery.
All connectors and buttons can be found on one side with the DC jack, four charging/capacity LEDs, the power button, 20V/3A and 12/2.5A barrel outputs, and four USB ports with 5V/2.1A or 5V.1.0A output. Most of the laptops I’ve used were powered by 19V or 19.5V adapters, so I’m not sure it’s safe to use with all laptops, but we’ll find out a bit more info about that below.
The power bank ships with a 100~240V AC to 16.8V DC/2.5A power supply, a power cord, a cable to connect to the 12V or 20V power barrel, 10 default adapters for various brands of laptops, 4 extra adapters for other laptops, K2 user manual, and an extra piece of paper explaining the extra adapters are used for Dell, Lenovo and Asus laptops, as well as providing some info on overcurrent and low current protection. There’s also a pouch bag to transport the power bank with an extra pocket for accessories.
We can learn a lot more by checking out the user manual like it takes 6 to 8 hours to fully, the battery is good for 1,000 charging cycles, and we cannot use 12V and 20V outputs at the same time. The power bank will automatically turn off after 30 seconds if there is no load or a load under the minimal current. It can also be used while charging.
The other side of the user manual explains more about the usage to charge smartphones, 12V cameras, and laptops. Al lyou have to do it to connect the cable, and press the power button. It also describes which adapter is suitable for a given laptops. It appears the power bank can be used for laptops with 16V to 20V, I’m not sure how different voltage levels are handled since there’s no selection.
The power bank weight around 1.3 kg in its pouch, accessories and power supply not included, so it’s like you carry an extra laptop with you.
I’ll report charging and discharging numbers with various devices in a separate post, and also quickly check if it can be used as a UPS or backup battery for batteryless devices, but it’s not advertised as such, so it may not work for that purpose.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.