Review ZMI PowerPack Aura 20K USB-C PD Power Bank

RATING-PERFORMANCE. Our portable devices can’t get enough. Phones, cameras, drones, laptops, tablets, MP3 players, headphones–you name it, they all need energy. If you’re traveling all day with your devices, how can you keep them all charged and ready for use? The answer is usually some form of battery. Older batteries were really heavy and usually very slow. You would charge your device, but it would take a long time. Nowadays, there are portable fast-powered packs that can quickly charge compatible devices. ZMI sent me his new Aura 20k in response to make everything work all day.

What’s this?

The external battery ZMI PowerPack Will support 20K USB-C PD is a battery of 20 000 milliampere-hour (mAh) with a nice selection of inputs and outputs for your needs.

What’s in the box?

  • Power Bank
  • Cable USB-C to USB-C in 20 inch
  • Composite Cable (Micro-USB and USB-C to USB-A 2-in-1 (12 inch)
  • Travel bag
  • User’s guide
  • Map with customer support contact information
  • The end of the battery connector was covered with the following warning sticker to, I’m sure, satisfy the lawyers.

Design and features

The Aura 2K is enclosed in a smooth plastic cover with a matte finish and very dark gray. The back of the device is engraved with all relevant information about load, capacity and recycling. This font is really small, so I had to photograph it to be able to read everything.

Both sides have a subtle diamond texture pattern. On the left we find a button that wakes the package when it is turned off and also shows the current loading percentage.

Each is marked with the port style and whether it can be used as an input port, output port or both.

It is important to note that at 74 watt hours, this package falls under the FAA & TSA policy of 100 watt hours or less for air travel. This means that you can take the Aura 20k in hand luggage when flying on a commercial aircraft. The capacity in watt-hours is indicated on the back of the bag to satisfy all overzealous TSA agents.


The configuration involves powered the device. I connected a USB-C cable that was connected to my Samsung 5V/2.4a charger.

Connecting the device wakes him up. It displays the current loading percentage:

It then shows an up arrow indicating that the charge is flowing into the bag.

This screen stays on for 20 seconds and then turns off to save energy. Pressing the button on the side will light up the screen for another 20 seconds. After loading, the package is ready for use.

You have options to charge the Aura 20k. USB-C and micro USB ports can be used to charge the Aura 20k. both are enabled for fast powered (QC) and the USC-C power supply is enabled for USB PD (powered by USB), as long as you use a PD compatible charger and a USB-C to USB-C cable.


I started with a quick test by inserting the USB-C to USB-C cable into the package and my Samsung Galaxy S9+. The package was immediately turned on and displayed its loading percentage.

A few days after I tried to charge two devices at once. My wife’s Samsung Galaxy S9+ was 74% charged and my S9+ was 54% charged. I connected mine to the battery’s USB-C power supply and connected my wife to a USB-A port using the 2-in-1 cable. Both phones charge quickly as expected. After both reached 100%, the battery was at 83%. Thus, a combined charge of 72% between the two devices took 17% of the battery. A little math suggests that the Aura 20k should be able to fully charge a dead S9+ about four times. I usually enjoy a full day of my S9+. To put all this in perspective, if I were traveling with the Aura 20k in my backpack, I could theoretically be up to five days away from a power outlet and use my phone to the full all the time. That’s pretty impressive. The other thing I noticed was the complete absence of heat after powering the two phones. The Aura 20k was cool as a cucumber. I’m used to batteries that get hot when they deliver high performance. It was another nice surprise.

In addition to the high output power that the Aura 20k can produce, pressing the side button twice puts the power supply into power-saving mode, which is indicated on the screen with “LP”.

The manual suggests that wearable devices such as headphones, smartwatches and fitness trackers are more suitable for a low-power load. The display of the package switches between LP and percentage load in this mode. It remains in LP mode for two hours or until it is released by pressing the side button once.

A simple press of the side button, when powering a device, turns on the screen for 20 seconds, switching between the powered percentage of the current battery and the down arrow indicating that the power is present. Interestingly, when you do this, the short charge is interrupted.

I tested it by loading or feeding a variety of items, and each time it worked perfectly. Here are the lightbox lights I use for product photography.

It also handled powered my iPod Touch and my charge unplugged 10k battery at the same time.of course, using one battery to charge another is a bit silly, but if you’re looking for items to test, take what you have.

A final test was to charge the battery and provide energy at the same time. Unlike the My charge unplugged10k battery I recently reviewed, which can handle the transmit power and charge while powered, the Aura 20k can’t handle this combined task. As soon as I connected the powered to the Aura 20k, it stopped powering the other devices. As someone who sails a lot, it’s important to be able to charge your battery while using it to charge a few devices, because cruise cabins don’t have many power outlets.

Final considerations

I really like this battery. With its flexible powered options as well as flexible power supply options, it offers many options in a small package. If he offered a pass-through power, that would be perfect. It is light enough to be thrown into a backpack and bring energy to multiple devices throughout the day. This now has a permanent home in the travel kit.

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