Cell Type: Lithium-ion
Cell Capacity: 20,000 mAh 3.6V 72Wh
Nominal Capacity: 12,000mAh @ 5V 60Wh (USB-C: 5V𝌂3A & 2× USB-A: 5V𝌂3A total); 2,800mAh @ 20V 56Wh (20V𝌂3.25A)
Maximum Charging Voltage: 12.6V DC
Input Port: 1× USB-C
Output Ports: 1× USB-C and 2× USB-A
Dimensions: 6.31 × 3.22 × 0.83 in (160.4 × 81.8 × 21 mm)
Weight: 15.52 oz (440 g)
Charge Time (h:mm)
# of Full Charges
iPad Pro (A1980)
iPhone XS (w/ USB-C to Lightning cable)
MacBook Pro 13” (A1708)
MacBook Pro 15” (A1707)
iPad Air (w/ USB-C to Lightning cable)
Dell Latitude 5285 2-in-1, 5289 2-In-1, 5290, 5290 2-in-1, 5490, 5491, 5590, 7285 2-in-1, 7290, 7389 2-in-1, 7390, 7390 2-in-1, 7400 2-in-1, 7490
1× PowerPack Pro 20K power bank
1× 20-inch USB-C to USB-C cable with E-Mark (rated for 100W/5A)
1× 12-inch USB-C to USB-A cable
1× travel pouch
1x Thank You Card
Q: Can I bring the portable charger/battery pack aboard a plane?
A: Yes, you can bring ZMI battery packs aboard a plane.
All ZMI battery packs have rated capacities below the limit of 100 watt-hours per FAA regulations pertaining to rechargeable lithium batteries.
However, please note: When travelling by plane, FAA regulations require you to store your portable charger/battery pack in your carry-on luggage, NOT checked-in luggage.
Q: It’s taking a long time to recharge the PowerPack Pro 20K. Is it okay to use the iPhone power adapter to recharge it?
A: The iPhone power adapter will slowly recharge the high-capacity PowerPack Pro 20K and may take over 24 hours to fully recharge, so while it may seem the PowerPack Pro 20K stopped recharging, it’s because the recharging is very slow.
The fastest way is to use a USB-C power brick with a USB-C to USB-C cable.
For example, the latest MacBook Pro power adapter will recharge the PowerPack Pro 20K in about 4 hours.
If it seems that the PowerPack Pro 20K is not recharging properly, make sure you try using a more powerful charger like the MacBook Air/Pro one or ZMI’s 45W charger.
Q: How long does it take to fully charge a PowerPack Pro 20K power bank itself? Can you charge it with your laptop’s charger?
A: If your laptop’s power brick supports USB Power Delivery, then you can recharge the power bank via your laptop’s power brick. Apple 29W, 30W, 61W, 87W, and Google Pixelbook’s charger all work well with the power bank.
The recharge time depends on the power brick used.
Here are some examples:
3.8 hours via a 45W PD power brick, 5.5 hours via 18W charger, and 8.8 hours via 10W (5V/2A) charger.
Q: Is it safe to charge the Dell XPS 13 using the PowerPack Pro 20K?
A: The PowerPack Pro 20K should charge your laptop properly.
Besides HP, Dell is one of the pickiest vendors in terms of what 3rd party chargers they feel are compatible.
Some customers have reported pop-up warning messages stating that PowerPack Pro 20K is an undersized charger when charging the XPS 13.
If your XPS 13 charges fine after you close the message window, there’s no need to worry about anything.
Our charger has been rigorously tested with many laptops, including the Dell XPS 13 and proven again and again to charge safely.
So rest assured that the PowerPack Pro 20K is both powerful and reliable and will work as well as your Dell 45W charger/AC adapter.
Q: Why should I purchase this battery pack?
A: Our new portable charger, the ZMI PowerPack Pro 20K sports a huge 20,000 mAh capacity and features both USB Power Delivery 2.0 and Quick Charge 2.0/3.0 fast charging support.
This means you can recharge your latest iPhone seven times and the latest Samsung five times!
Along with a USB Hub mode, this powerful, versatile backup battery is the ideal accessory for your laptop, smartphone, tablet, or gaming console
Those are just a few reasons why you need to get a PowerPack Pro 20K today!
Q: Does the PowerPack Pro 20K have a smaller capacity than 20,100 mAh batteries?
A: The PowerPack Pro 20K actually has a nominal capacity exactly equal to 20,100 mAh.
Like many 20,100 mAh battery packs on the market, the PowerPack Pro 20K is made of six LG 18650 (battery size) lithium-ion cells, each with a nominal capacity of 3,350 mAh. 3,350 mAh x 6 gives 20,100 mAh.
For marketing reasons, the “100” was rounded off.
In short, although it’s called the PowerPack Pro 20K, the actual capacity is the same as 20,100 mAh.
Q: After working for a while, the PowerPack Pro 20K is no longer charging my phone. How to fix this problem?
A: If you are having problems charging your phone with your PowerPack Pro 20K, please take a look at these tips.
Your phone’s charging cable may be broken or faulty.
Try charging your phone with a different cable. Or use the same cable and a different charger.
The PowerPack Pro 20K may be out of power.
Check the power level by pressing the charge level check button on the side and see if any lights are blinking on the ports side.
If none of the lights are on, try recharging the PowerPack Pro 20K with the recharging cable included in the box and your own USB wall charger/power plug.
The PowerPack Pro 20K may be turned off.
Our portable chargers (and most on the market) will automatically turn off after 30 seconds if no connection is detected.
To wake up the PowerPack Pro 20K, press the charge level check button on the side once.
Q: What is pdo and pps? also how to enable it?
A: PDO stands for Power Data Objects, and PPS stands for Programmable Power Supply. These are two terms used in the USB Power Delivery 3.0 protocol.
The power supply (in this case the battery pack) and the device (that is, a phohe, tablet, or a laptop chargeable via a USB-C port) will communicate and negotiate in accordance with the USB Power Delivery 3.0 protocol and then determine which PDO or PPS profile to enable.
All is automatically done without user input.
Q: Does this power bank have all these certifications, fcc, ce, sgs na listed, bc, rohs. if so does it say directly on the power bank?
A: This battery pack has FCC, BC, UL 2056, UL 60950-1, DOE, CEC, and TPCH.
This product does not have CE or RoHS, both of which are EU-specific requirements.
The casing of the battery pack bears FCC, SGS, and BC marks.
Q: Will this charge low power devices like apple watch, air pods or beats solo pro? is there a trickle-charging mode?
A: Yes, it can charge low power devices. The USB hub mode also works to provide trickle charge. Double-press the side button to enter the USB hub mode and press one time to exit. Please note there’s a 2-hr timeout for trickle charge.
Q: How should this be charged?
A: Plug a cable into the center USB-C port.
Q: Can i charge this with my macbook pro 15 (2019) charger? it’s an 87w usb-c power adapter model a1719 output 20.2v – 4.3a or 9v – 3a or 5.2v – 2.4a?
A: Yes, you sure can. This battery pack can charge the MBP 15. You can recharge the battery pack with your Apple stock 87w power brick.
Q: In the pictures it shows 45w fast recharging into the usb c port, but it also shows a 65w charger. which is it, 45w input or 65w?
A: The input is 45W. The 65W charger in the image is one that we show as an example of a good charger that will recharge the PowerPack quickly.
Q: Will this effectively charge my surface pro 7?
A: Yes, it will.
Q: What is the actual capacity for this powerbank?
A: Cell Capacity: 20,000 mAh 3.6V 72Wh (Watt-Hours).
Nominal Capacity: 12,000mAh @ 5V 60Wh (USB-C: 5V 3A & 2× USB-A: 5V 3A total); 2,800mAh @ 20V 56Wh (20V 3.25A)
Please note that a common misconception is to read and compare mAh measurements without realizing mAh measurements may be taken at different voltages. A simple and direct metric of capacity is Watt-hours.
Q: I this certified to charge the Google Pixelbook?
A: There’s no charger certification specific to Google Pixelbook. Incidentally, we have obtained FCC, NRTL, and DOE+CEC certifications for the battery pack. NRTL certification includes UL 2056 and UL 60950-1.
Are you a MacBook or Pixelbook owner? Both the new MacBook and Pixelbook boast a full day’s worth of battery, but is that good enough?
Over time, your laptop battery’s capacity will diminish and replacing it every few years can be expensive.
What used to be a full day of charge could turn into a few hours depending on your power usage.
Perhaps, you are someone who wants to go several days without plugging your laptop into a wall adapter. Or maybe you are someone who wants the flexibility to charge your laptop anywhere, anytime.
When you’re at school, work, a coffee shop, or a library, it can be a hassle to search for an open wall outlet or be stuck in an awkward position near the outlet waiting for your laptop to charge.
With the PowerPack Pro 20K, you get a reliable backup battery that will free you from the wall outlet.
Instead, you can be lying on the couch or outside in a park and charge your laptop comfortably and stress-free.
One great thing about the new MacBook, MacBook Pro, and Pixelbook is that they all offer at least one USB-C port capable of charging with Power Delivery (PD).
With the right USB-C cables, Power Delivery will deliver faster charging and more power up to 100 watts.
USB PD is not only compatible with smaller devices like smartphones and handheld gadgets, but also larger devices like laptops, printers, and displays.
The PowerPack Pro 20K is fully compatible with the PD standard, so you can rest assured your device (whether it’s a smartphone or a laptop) is being optimally charged for faster speed and safety.
With Google and Apple adopting the Power Delivery standard to their devices, other smartphone and laptop manufacturers will likely soon follow their footsteps and include PD support with their future devices.
So even if you’re not a Google or Apple customer, investing now in a PD-compatible charger will be worth it in the long run as the standard becomes ubiquitous.
Is one port on your MacBook not enough for you?
The PowerPack Pro 20K will provide you with 2 additional USB 2.0 ports with its Hub mode for fast data transfer.
Are you a business person who needs to work while travelling?
A portable office is what you need. The PowerPack Pro 20K will let you connect a mouse or an external drive to your laptop with ease, so you can stay efficient even 40,000 feet in the air.
Are you an avid Nintendo Switch gamer?
Hook up the PowerPack Pro 20K to an external display or the Switch Dock and you’ll have the ultimate Nintendo gaming experience.
Whether you’re a hardcore gamer or your work requires a lot of process-heavy software like video editing or 3D modelling, the PowerPack Pro 20K will take care of your charging needs.
Now, you no longer have to worry about your battery dying when you’re in the middle of an intense game or important project.
Take your work (or game) wherever with the full confidence that your devices will stay charged and your lifestyle stays uninterrupted.
Are you an outdoors person who loves camping, hiking, or mountain climbing?
Whether you’re pitching a tent in your backyard or exploring the Himalayas, the PowerPack Pro 20K will again ensure your portable electronics are powered.
Even if you’re stuck in the middle of nowhere with no power outlet in sight, you can keep all of your devices (phone, tablet, laptop) charged without worry.
The PowerPack Pro 20K’s built-in protective mechanism against short-circuiting may have been triggered by a short on an output port; the PowerPack Pro 20K is now in a protective mode and won’t respond to button presses or charge your phone.
The PowerPack Pro 20K was designed to safeguard against short-circuiting due to inadvertent or deliberate causes.
Short-circuiting on an output port can occur as a result of using a frayed or damaged charging cord.
Short-circuiting can be either temporary or persistent.
How many of us have continued to use a phone cord with broken sleeving?
Solution: Fortunately, the battery pack is only in a temporary, protective mode, waiting to be revived.
To revive it, connect the battery pack to a wall charger (AC adapter) via a good charging cord and plug the wall charger into a wall outlet; unplug and replug the battery pack’s side of the cord while the wall charger stays in the outlet.
That’s it! Your PowerPack Pro 20K will be as good as new.
To avoid the protective mode being triggered again, it is strongly suggested that you replace your frayed/damaged cord ASAP.
Based in Sunnyvale, California, USA.
We are a forward-thinking company that seeks to bring pure, simple, and economical gadgets to market while focusing on using the most premium of components to create products that exceed the quality of our competitors.
We believe in saving money on unnecessary frills and flashy marketing, so we can pass on those savings to our customers, we instead spend our time and money on improving the quality and reliability of our products.
Since being established in 2014, we have been working to meet this challenge and have cumulatively sold over 100 million portable chargers/battery packs worldwide.
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Email: email@example.com, M-F 9:00 am to 5 pm